I( )my wallet when I was shopping in the store.A、must have droppedB、should have

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问题 I( )my wallet when I was shopping in the store.

选项 A、must have dropped
B、should have dropped
C、could drop
D、ought to have dropped

答案 A

解析本题考查情态动词表示推测的用法。must have done sth．表示对已经发生的事情的肯定猜测。这道题是对过去所发生的事情的推测，因此应选择A。

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