------Tom is never late for work. Why is he absent today?
------ Something _______ to him.
A．must have happenedB．can have happened
C．must happenD．can happen
A

試題分析：根據(jù)句意：湯姆從來不遲到。為什么今天遲到了呢？他肯定是出了什么事。
must have done 過去肯定做了某事，對過去的肯定推測。
對過去的否定推測應(yīng)用 can’t have done.一般沒有B這種形式。C表對現(xiàn)在的推測，不對。
點(diǎn)評：本題是高考必考考點(diǎn)，一定要牢記句型意思。must have done過去肯定做了某事。
should have done 本應(yīng)該做而實(shí)際未做。 can’t have done 過去不可能做了某事
shouldn’t have done 本不應(yīng)該做而實(shí)際做了。 need have done 本有必要做某事
needn’t have done 本沒有必要做某事
注意沒有 mustn’t have done的形式
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