广东学士学位英语语法学习及解释（6）

        【十七】

        例     my wallet when I was shopping in the store.

        A. must have dropped

        B. should have dropped

        C. could drop

        D. ought to have dropped

        【答案精解】A。本题考查情态动词表示推测的用法。must have done sth.表示对已经发生的事情的肯定猜测。这道题是对过去所发生的事情的推测,因此应选择A。

        【参考译文】我肯定在那个商店里买东西的时候把线包丢了。

        【十八】

        例She      be ill because I saw her playing tennis just now.

        A.can't

        B. couldn't

        C. mustn't

        D. may not

        【答案精解】A。本题考查情态动词表示推测的用法。“不可能”用can’t,因此A正确。because 引导句中的原因状语从句,解释为什么不可能的原因。

        【参考译文】她不可能病了,因为我刚才还看见她打网球呢。

        【十九】

         He abandoned a career that     to his becoming one of the most influential people in the world.

        A. could have led

        B. would lead

        C. should have led

        D. must lead

        【答案精解】A。本题考查情态动词could表示可能的用法。could have done sth.表示本来能做的事情没有做。因为他放弃(abandon)了,而且是对过去可能发生的情况的猜测,所以选择A。

        【参考译文】他放弃了一份很有可能让他成为世界上极有影响的人物之一的事业。

        【二十】

        例Sorry,officer.I     at 80 miles but l didn't see any sign in the area telling people how fast they can drive.

        A. should not drive

        B. shouldn't have driven

        C. mustn't drive

        D. can't drive

        【答案精解】B。本题考查的是“should not have done”的用法。should have done sth.表示应当做的事情而实际没有做。否定式是should not have done sth.,表示不应当做的事情却做了。因此选择B。

        【参考译文】对不起,长官,我不应当开80码,但是我在这里没有看见任何标志告诉人们可以开多快。