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【OG18-P692-731题】

To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.

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  • 分析B选项 分析选校图标
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  • 分析C选项 分析选校图标
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  • 分析D选项 分析选校图标
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  • 分析E选项 分析选校图标
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暂无雷哥网文字解析
当前版本由 小白白哈哈 更新于2015-07-12 14:26:49 感谢由 小白白哈哈 对此题目的解答所做出的贡献。
本题的意思是说想到达到什么,人口学家就得怎么样,逻辑语义上需要用虚拟语气,排除AB,economic 是经济的而economical 是节俭的,排除C;more than 前后成分要具有可比性,排除E。
当前版本由 miya77 更新于2017-09-01 21:46:31 感谢由 miya77 对此题目的解答所做出的贡献。

than前后平行,they know对应they do now,排除AE

economical是经济的,划算的,排除BC

选D 

当前版本由 西格玛 更新于2020-08-25 13:45:03 感谢由 西格玛 对此题目的解答所做出的贡献。

时间状语的比较,能否省略取决于than前面是否有相应的时间状语。有的话,than后面主句可以省略;没有的话,than后面需要补出主谓,以避免比较对象上的歧义。

  To develop more accurate population forecasts, demographers would have to know a great deal more than(they do) now about the social and economic determinants of fertility.

  [they do]不能省略,因为than前面没有相应的状语结构



题目讨论 (23条评论)

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    499685skw

    原句应该是有一层假设的意思,或者说是省略了if:(如果)要发展什么就要怎样怎样。所以应该要加虚拟语气词,排除AB。其次,前后比较的是科学家知道的情况,所以是they do now而不是now而已,所以排除E。最后,economic是“经济的”意思,而economical是“节俭的”的意思,选D。
    0 0 回复 2022-09-29 20:28:23
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    217926act

    have to know more 和 know now不一样,注意,什么时候可以省略,主语谓语是否完完全全一样!
    0 0 回复 2022-08-27 00:09:15
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    ziqi

    Stanley想去荷兰
    1.economic和economical 排除BC 2.AE选项比较项没有给出,than前a great deal然后没了。than后只有now副词,而than前并无时间副词与之对应——要求正确画出比较对象,时间副词的话也要有比较性 3.正确选项know a great deal 比较they do now有点比较性 4.再说would 和have to:would have to know是不很肯定的语气,其表达的是have to do的内容只是一个假设,并不是真的"必须",而have to表达的意思是,要做的事情非常重要,"必须"去做。这里并不区分
    0 0 回复 2022-04-07 20:17:14
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    shadowland750

    more than now错,排除AE,
    economical错,排除BC
    所以选D
    跟虚拟无关,应该有没有would都对
    2 0 回复 2021-10-06 08:52:48
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    chicaicai

    真觉得这道题出的有点没水平
    13 1 回复 2020-03-22 11:50:06
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    。。。?

    不能省因为时态语态都不同。have to 和 would have to实际上都说的过去,并不能作为决定性排除因素。
    7 0 回复 2019-12-13 04:09:25
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    Stanley想去荷兰

    1.economic和economical 排除BC
    2.AE选项比较项没有给出,than前a great deal然后没了。than后只有now副词,而than前并无时间副词与之对应——要求正确画出比较对象,时间副词的话也要有比较性
    3.正确选项know a great deal 比较they do now有点比较性
    4.再说would 和have to:would have to know是不很肯定的语气,其表达的是have to do的内容只是一个假设,并不是真的"必须",而have to表达的意思是,要做的事情非常重要,"必须"去做。这里并不区分
    0 1 回复 2019-11-24 16:02:05
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    园园爱吃肉

    为什么不能省略主谓?
    3 0 回复 2019-11-22 10:06:05
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      320730ml回复园园爱吃肉

      省略的话就是a great deal和now平行了

      0 0 回复 2021-10-25 22:02:12

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    cola

    a e 应该是后面用now省略后容易引起歧义吧?
    还原后可能是demographers have to know a great deal more than (they have to know) now about the social and economic determinants of fertility.
    翻译完就是人口学家们必须要知道要比他们现在必须要知道的多,逻辑上很不通畅
    但后面写成more than they do now就消除了歧义
    3 0 回复 2019-11-15 16:53:01
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    Kellllly

    more than they do now, 说明现在没有,虚拟语气
    0 0 回复 2019-10-28 19:57:20
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    nanhahaha

    economical 用词不对排除BC,AD than后面紧跟的是now 表示比较的是时间 通读选项比较的应该是 know a great deal more 这件事 所以选D
    0 0 回复 2019-08-05 14:59:12
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    炒肝烧鹅黄鳝粥水煎包

    和虚拟语气完全没有关系!A选项:比较对象不正确,我们应该比较的是不同时间的两件事,而不是两个时间(now),所以只能选D。
    2 0 回复 2019-07-05 09:52:03
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    700召唤小太阳

    1.have to know/would have to know/will have to know都是对的
    2.假想中的正确句子是:
    To develop more accurate population forecasts, demographers have to know a great deal more than (they know) now about the social and economic determinants of fertility.
    事实上:
    because "they know"isn't in the first part. if a construction can be omitted, then the same construction should exist elsewhere in the sentence. here, it doesn't; the omitted portion would be assumed to correspond to "demographers have to know", which doesn't make any sense.
    和:
    I walked faster now than (I walked) when I was young.  是完全不相同的
    1 0 回复 2018-10-14 00:32:43
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    Deborah

    首先ron说,决策点不在have to or would have to 上
    RON:i think this sentence makes sense with either "would have to" or "have to". there's a slight rhetorical difference ("would have to" carries the connotation that these forecasts are just hypothetical and don't actually have to be developed, or that at least it's not important, while "have to" implies that these forecasts are important and have to be made), but you don't have to make such rhetorical distinctions on the exam.
    in this case, you don't have to, since both choices involving "have to" (without "would") are wrong for other reasons.
    
    A)的错误点是more than they do now而不是 more than now
     Consider the following example 
    I have to run faster than now. ------This is clear incorrect. what is now? This doesn't make any sense 
    I have to run faster than I do now.---- Correct
    B)错误点在economical--是节俭的;效率的意思,不是经济的意思
    C)错误点同B
    D)正确
    E)错误点同A
    4 0 回复 2018-06-11 16:08:18
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      黄三胖胖胖回复Deborah

      请问一下为什么不能省略they do呀?

      0 0 回复 2018-06-15 13:31:43

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      Mmmmm回复Deborah

      这个解释超棒了

      0 0 回复 2018-06-20 21:01:58

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      ArchZoo回复 黄三胖胖胖

      I have to run faster 3 days later than (I DO) now;

      0 0 回复 2018-07-29 17:43:17

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    fuksurgen

    deepakdewani wrote:Hi Ron,
    
    In one of the other threads that I have seen (and I am sure that in several others), you mentioned that in parallel constructions, if the verb in the second part of the construction is "absolutely the same" as in the first part of the construction, then that verb may be omitted in the secod part.
    
    My question is: Can't the above principle be applied to Choice A above since the omitted portion in the second part, i.e. "they know" has the exaclty same verb as the first part?
    
    Thank you for your help.
    
    
    yep, i did say that. unfortunately, that principle does not apply here, since the verb that you're trying to omit is not exactly the same as its counterpart.
    specifically, the first verb is in a hypothetical/conditional tense (would have to know...), while the second verb is in the present tense (they do [= know] now). you are not allowed to imply such tense transitions.
    if you omit the verb, the omitted verb will be assumed to be in the same tense as its parallel counterpart. since you have to change tenses in this problem, you must include both verbs.
    1 0 回复 2018-01-21 16:20:44
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