My wallet is nowhere to be found. I________ when I was on the bus.A、must drop it

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

选项 A、must drop it
B、should have dropped it
C、must have dropped it
D、had dropped it

答案 C

解析本题考查情态动词用法。根据句意，我推断我肯定是把钱包掉车上了。A、D没有推断的意思；B是指“本应该做某事”；C是指“一定……”。所以选C。句意：我的钱包哪儿都找不到，我肯定是坐公交车时掉了。

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