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-I can't find my wallet.

-You ________ it on the bus.

[  ]

A.must forget

B.must leave

C.must have forgot

D.must have left

答案:D
解析:

本题旨在考查“must have done”的含义。情态动词可以用来表示“certainty可能性的”,常用来表示推测,现在或过去的推测。must do与must have done在表示推断时所表达的时间概念不同,前者表示目前存在的状况,后者表示过去或现在必定已经发生的事。must have left it on the bus意思是“肯定丢在公共汽车上了”。


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