题目内容
【题目】
He ______ have sent the e-mail at an earlier time, but there was something wrong with the network.
A. must B. should
C. could D. might
【答案】C
【解析】 句意:他本可以早点发邮件的,但网络有问题。考查情态动词。could have done 本可以做某事,其实没做,符合题意。
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