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

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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推测的用法，must have done表示对过去情况的肯定推测。题意为我一定是在逛街的时候把钱包丢了，所以应选A。

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