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Less than 35 years after the release of African honeybees outside Sao Paulo, Brazil, their descendants, popularly known as killer bees, had migrated as far north as southern Texas.
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
我有更好的解析 
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原句句子结构：(Less than 35 years…,) their descendants…had migrated…
原句表达逻辑语义：在巴西的圣保罗外释放了非洲蜜蜂的不到35年里，他们（蜜蜂）的后代，俗称食人蜂，已经迁徙到北至德克萨斯南部。
A. 正确
B. their descendants做句首短语releasing的逻辑主语，句义不合理。
C. since与had done动词形式错误。
D. it无所指：it做形式主语时指代不定式或者that从句；when their descendants had migrated as far north as southern Texas导致句子逻辑变化。
E. 连词and改变原句合理语义；and前后平行主语有歧义。
SeasonLiew
如果A答案是正确的话那主句的 their就没有办法指向 honeybees，太烂了这道题
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2020-05-19 22:58:53
anina回复SeasonLiew
我也是这样直接就排除了A
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2021-08-27 18:58:23
194020wxnp
①动词时态能否将动作逻辑表达出来 ②特定结构用法是否正确（it took...to do） B. 无法判断第一个动作的时态； releasing的逻辑主语错误 C. 两个动作都是过去完成时就无法判断两动作的先后了 D. it took +时间+ to do E. 同D
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2020-04-24 09:50:49
200969kx
搬运一下！针对这题很详细！建议康康！http://www.beatthegmat.com/mba/2012/02/05/more-on-meaning-a-gmatprep-sentence-correction-problem
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2020-01-03 17:23:26
Co11in
我感觉DE中的it不是形式主语，只是it不能指代真正的主语killer bees，所以排除DE B中since releasing是主动关系，不能说killer bees release了自己，只能是被released C中过去完成式使用错误，不能主从句都是过去完成时
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2019-12-03 15:34:26
Gmat拯救世界
since 现在完成时
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2019-10-06 12:57:30
靓仔啊小李
Since应该是可以和现在完成时连用的 但是release不是持续性动词。since要加持续性动词。
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2019-09-09 09:38:54
zrayh1
我觉得用时态来看吧。 句子后半部分用的是过去完成式， 那么release就应该用过去式更准确，但是 c 不是用过去是，而A中的时间暗示了release在migrat之前更准确
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2019-05-21 23:29:51
饮屠苏
less than 前面为什么不加介词呀？
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2019-03-10 22:12:28
Commsnd回复饮屠苏
"In less than the 35 years" is idiomatically incorrect. The proper idiom would be "In the less than 35 years"
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2019-03-13 08:55:21
Joyce L回复饮屠苏
有after
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2019-07-06 05:53:32
589285dk回复饮屠苏
后面有had done的，需要after的
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2019-11-26 09:41:03
阿萌
分享this is a tricky one.
if you were narrating in the present tense, you'd say the following: 'as of today, the bees have migrated as far north as southern texas.' therefore, since this sentence describes a situation in the past (it describes the situation 35 years after the release, which is before the present), you translate all present-tense verbs into the past tense. this turns 'have migrated' into 'had migrated'.
there is no explicit description of the 'second event' you're looking for in this problem, which is what makes it difficult. instead, the 'second event' is the point on the timeline, 35 years after the release of the bees. because the sentence describes a trend whose relevance continues up to and through that point, a perfect tense is appropriate.
wrong answers:
* choice b implies that the honeybees' descendants somehow released them (perhaps a very bizarre case of karmic cycles, but absurd no matter what).
* choice c: 'the 35 years since' implies that the present is 35 years after the release date. not only does this conflict with the meaning of the original, but it also renders the past perfect (from the underlined part) inappropriate: you'd need present perfect in this case. also, since the release is a point event, it would belong in the simple past.
* choice d: in this sentence, the commas + non-essential modifier ('..., when') seem to imply that the descendants' migration took place simultaneously with the release of the original honeybees. in addition, in this sentence, 'it' refers to some unspecified event (it can't refer to the descendants' migration, for the aforementioned reasons).
* choice e: all kinds of problems with this one. if you don't see what's wrong with it, reply and we will elaborate.
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2018-11-10 04:46:59
阿萌
Two main splits: (1) "Less than 35 years after" vs. "In less than (the) 35 years since." Not only is (A) 1 or 2 words shorter in this split, but the extra words in (B) and (C) don’t really serve a purpose. "In" is not necessary, as the meaning in all three is that within 35 years, the migration occurred. Likewise, the "the" is optional. Also, there is a subtle meaning difference. "Since" is typically used for ongoing actions, implying that the bees were released 35 years ago and in the time "since" then the migration has occurred. I think this would require the non-underlined main verb to be "have migrated." On the other hand, "after" simply means that whenever the release happened, by 35 years later on the time-line, the migration had already occurred. This justifies the use of the past perfect "had migrated" in the main clause of the sentence. (2) The form of the word "release" (A) "the release": This is OK, as it is a noun. "...35 years after noun (the event, in this case the release of bees) (B) "releasing": The -ing form makes the entire phrase a modifier. It forces us to ask and answer the question "WHO released the bees?" The answer must follow the comma after the modifying phrase, but instead of a logical bee releaser (people), we find the bee’s descendents after the comma. (C) "had been released": passive voice, which could be OK, but we don’t really need it here. Generally, stick with active unless you need passive voice, or unless the other choices all have other errors.
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2018-11-10 04:41:23
考到770不是梦
这个题是唯一一个看ron解释还不明白的题，纯靠感觉选的……
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2018-10-31 10:49:25
发呆的夜之亡魂
有人和我一起在做这道题的时候想到奇拉比吗？
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2018-07-06 15:30:24
默默
since一般用于现在完成时
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2018-04-30 05:14:48
默默回复默默
形式主语也要有所知道的，不可随意乱用
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2018-04-30 05:15:58
默默回复默默
可还原成主句的
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2018-04-30 05:16:08
曼迪小朋友
Ron的解释
wrong answers:
* choice b implies that the honeybees' descendants somehow released them (perhaps a very bizarre case of karmic cycles, but absurd no matter what).
* choice c: 'the 35 years since' implies that the present is 35 years after the release date. not only does this conflict with the meaning of the original, but it also renders the past perfect (from the underlined part) inappropriate: you'd need present perfect in this case. also, since the release is a point event, it would belong in the simple past.
* choice d: in this sentence, the commas + non-essential modifier ('..., when') seem to imply that the descendants' migration took place simultaneously with the release of the original honeybees. in addition, in this sentence, 'it' refers to some unspecified event (it can't refer to the descendants' migration, for the aforementioned reasons).
* choice e: all kinds of problems with this one. if you don't see what's wrong with it, reply and we will elaborate.
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2017-11-10 18:21:05
已经好几战了回复曼迪小朋友
我就选的e，就不解释了，汗！
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2018-04-03 17:26:26
fuckgmat回复 已经好几战了
亲，E是最不需要解释的，这个错的最离谱，结构上千疮百孔
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2018-06-11 04:12:03
桃子君
为什么C选项不能加in？主句虽然用过去完成式，但要表达它的过去不还是只能用过去完成式吗？
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2017-10-08 11:40:38
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