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took away our teacher's cell phone without being permitted

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took away our teacher's cell phone without being permitted
Tom took away our teacher's cell phone without being permitted.
Really?i can't imagine that he _____ have done such a thing.
A.must B.may C.can D.should
should have done 是本来应该做的事没做.‘这个句子不是已经做了吗?怎么理解选择D.
took away our teacher's cell phone without being permitted
答案:D
should还有一个特殊用法,意思是“居然,竟然”,用于表达说话人惊讶、不相信、怀疑等语气.
should have done sth在此种情况下,解释为“居然/竟然做了某事”.