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

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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 考查情态动词和时态。句意:我的钱包找不着了,我推断我一定是把钱包落在公交车上了。must have done表示一定已经做了,故选C。
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