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【OG20-P814-904题】
By 1999, astronomers had discovered 17 nearby stars that are orbited bv planets about the size of Jupiter.
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选A
A选项:正确。注意时态,定语从句 that are orbited by planets about the size of Jupiter中的一般现在时是正确的,因为17颗星星被环绕是一个客观事实,这个动作的时间不受discover的发生时间的影响。
B选项:首先,with planets orbiting them是一个独立主格结构,其应改为修饰stars的定语从句。这是因为,独立主格是状语,修饰的是discover这个句子。在逻辑上,不能说“伴随着星星被环绕,科学家们发现了17颗星星”,而应该是“科学家发现了17颗被环绕的星星”。且that were这里是过去时,意思变成这些行星“过去”和木星一样大,但现在不一样了,这是不合逻辑的,应该用一般现在时表示一个客观事实。Them指代歧义。
C选项:时态错同(B)。
D选项:by 1999,过去的过去,要用过去完成时;独立主格错同(B)。
E选项:by 1999,过去的过去,要用过去完成时;discover接宾语从句that 17 nearby stars are orbited by planets,核心语义有误,逻辑上,天文学家发现的肯定是星星,而不是星星周边的事情。
题目讨论 (10条评论)

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680461elv
by (一个过去的时间)是过去的过去,要用过去完成时
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0 回复 2022-08-17 10:51:02
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TQ
DE 排除因为时态应该是用过去完成时, 因为有by 来引导时间状语从句: 与过去完成时连用的时间状语可以是already(已经),yet(仍然),still(还),just(刚刚),hardly...when(刚……就),scarcely...before(刚……就),ever(曾经),never(从来没有)等,也可以是by(不迟于),before(在……之前),until(直到),as soon as(一……就)等引导的词组或从句:
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0 回复 2020-12-24 04:28:23
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猪猪精上740
b,中的that 到底修饰stars还是planets不清楚 排除b 原文about the size of Jupiter应该修饰planets
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0 回复 2019-10-13 08:19:00
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霜刃未曾试
看起来是客观真理,但是事实上更应该考虑的是with后置后,that were的指代错误
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0 回复 2019-07-23 12:28:01
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huang642
there be句型选择优先级低,因为wordy
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0 回复 2019-05-14 06:40:11
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嘉仓佑措
CDE用时排除无异议,但我不同意B使用时态排除,因为它把科学真理用修饰语表示出来,也就没有了时态这一说法。而that were 从时态上讲不是大问题,因为原文对“体积”也是修饰语,没有时态。真正的问题是that were错误的修饰了stars,改变了原意。虽说可以跳跃修饰,但还是会有歧义
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0 回复 2019-04-08 23:32:04
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yolanda8回复嘉仓佑措
A B 语义差别在于:A 表达的是发现了stars, B表达的是 发现了stars with planets 语义很不同,同时B中用were的过去时态是不对的,应该用are
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0 回复 2020-04-21 09:49:26
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抖胖小肉
考点:动词形式 句法结构 分析:by+时间,时态只能用过去完成时或将来时,可排除DE; A.正确; B.them指代stars,that就近修饰,stars和Jupiter一样的size,语义不合理; C.there were表达wordy; D.时态不对; E.时态不对;
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0 回复 2019-03-31 14:24:43
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monafightforgmat
过去完成时的使用:1.time marker(by...)2.past time verb
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0 回复 2019-01-07 16:11:27
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GMAT小螃蟹
The thing is whenever we read a sentence, we try to understand the meaning conveyed by it in its entirety. Hence, when we read Choice B, we understand that the sentence intends to say that the scientists had discovered 17 stars and planets orbited them. The error with Choice B is that it suggests that the planets orbited the stars. They do not do so anymore. This is so because the main verb in Choice B is in past tense. Hence, the verb-ing modifier orbiting adopts the tense of the main verb and thus expresses illogical meaning. However, the correct answer choice A makes it absolutely clear that the planets still orbit these stars. Choice C too repeats this meaning error. Choice C says that that the 17 stars discovered by the scientists existed in he past, and the planets orbited them in the past. Per the original sentence, the stars do exist in the present because some planets do orbit them.
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0 回复 2018-09-11 21:29:58
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Jecci回复GMAT小螃蟹
懂了!原来A & B关键是时态问题!科学定理是一般现在时!更何况A比B简洁,所以选A
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0 回复 2018-11-22 10:22:31
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嘉仓佑措回复GMAT小螃蟹
我很怀疑这是不是Ron的回答,他应该不会解答og的题
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1 回复 2019-04-08 23:20:10
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好小乖
不懂c哪里错了,重点是发现了什么星星还是发现了整个事件都有道理啊
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0 回复 2018-08-18 12:07:16