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I’m sorry, Bill. I _________ the book to you last week, but I was so busy that I forgot to do so.

A.must have returned

B.could return

C.should have returned

D.might return

 

【答案】

C

【解析】本題考查情態動詞。句意:Bill, 很抱歉。上周我就該把書還你,可我太忙了。忘記了。should have done只用于談論過去情況,主要有兩個用法:一是用于推測過去已經發生的情況,二是用于指本該發生而實際上未發生的情況。

 

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