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编辑推荐：2015成人英语完型填空练习题汇总
情态动词的被动语态构成：情态动词+be+过去分词
例：I can′t find the recorder in the room. It _____ by somebody.
A. must have taken B.may have taken C.may have been taken D.should have been taken
【答案】C
此题考察的是综合知识点。首先是被动语态，录音机被人拿走了。另外还考察了情态动词加完成式表示对过去时间的推测。
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