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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 returnedB.could returnC.should have returnedD.might return
C
本题考查情态动词。句意:Bill, 很抱歉。上周我就该把书还你,可我太忙了。忘记了。should have done只用于谈论过去情况,主要有两个用法:一是用于推测过去已经发生的情况,二是用于指本该发生而实际上未发生的情况。
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