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
本題考查情態(tài)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(jīng)發(fā)生的情況，二是用于指本該發(fā)生而實際上未發(fā)生的情況。
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