—Where is the reference book? It was here a moment ago.—Someone must (take) ____

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问题 —Where is the reference book? It was here a moment ago.—Someone must (take) ______ it by mistake.

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答案 have taken

解析本题测试的是固定搭配。全句的意思是：“我的参考书呢?刚才还在这儿。一定是有人拿错了。”must have done是固定搭配，表示对过去发生的事情的肯定推测。因此，应该填have taken。

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