My wallet is nowhere to be found.I_____it when I was on the bus.-查字典考试网

My wallet is nowhere to be found.I_____it when I was on the bus.

A、mustdrop
B、shouldhavedropped
C、haddropped
D、musthavedropped

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正确答案：

答案解析：

musthave+done用于推断过去某个时间肯定发生了的事情。

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