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 I have lost one of my gloves. I _____ it somewhere.

A. must drop                    B. must have dropped

C. must be dropping              D. must have been dropped

 

【答案】

 B

由题干而知不用被动,排除选项D;题干说“已经丢了”,排除选项C;选项A“情态动词+动词原形”,表示对现在或将来的事情推测;选项B“情态动词+动词的完成时”表示的是对过去或已经发生的事情的推测判断,所以选B。17. B本题考查情态动词。mustn’t这里表示“不允许,禁止”,此句中相当于can’t . shan’t . 句意:汤姆,你不可以(表禁止)把衣服这样丢在地板上。

 

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