歌德巴赫猜想（大全505）

1.        Migraine, the most debilitating common form of headache, afflicts perhaps 18 million Americans, who collectively lose 64 million workdays a year, and they cost the nation $50 billion in medical expenses and lost work time.

(A) year, and they cost the nation $50 billion in medical expenses and lost

(B) year and thus cost the nation $50 billion in medical expenses and lost

(C) year, so as to cost the nation $50 billion in medical expenses and lost

(D) year that costs the nation $50 billion in lost medical expenses and（B）

(E) year, which thus cost the nation $50 billion in lost medical expenses and

A：they只能指代Americans，错，无此用法。

B：cost如果是一般时，数不对，如果是过去时，不平行

C：so as to仅用于系表结构，且仍不能确定是Migraine cost还是Americans cost

D：that修饰对象错

E：which修饰对象错

所以，此题唯一可能的答案就是-------------------F。

    B的cost的发起者是18 million Americans

   数是对的

   题目的疑问人如何去cost

   这个题目讨论很多，你找几个帖子看看

   祝tony考出N分

将B代入：

Migraine, the most debilitating common form of headache, afflicts perhaps 18 million Americans, who collectively lose 64 million workdays a year and thus cost the nation $50 billion in medical expenses and lost work time.

cost 的逻辑主语是Americans, 为一般现在时。

哈哈，和power撞楼了！

“ 题目的疑问人如何去cost”

偶觉得这里关键是用了thus这个词。请参考longman上的解释：

thus / ðʌs / formal
1[sentence adverb] as a result of something that you have just mentioned

还是要去看看前辈们的讨论......

     呵呵，我是被歌德巴赫猜想吸引进来的。。。

     LES定下什么时候考了么？？

看来为帖子取个好名字还4很重要的吗，哈哈

偶前些日子发贴，都冠以“大全XXX”或“OGXXX”，多数都寻8见踪影了，5555

看来，MARKETING真的很重要哎，。。。CC

咳，总要考的......