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 本题考查情态动词的特殊用法。句意:我的钱包找不到了,肯定是我在坐公交车的时候把它弄丢了。must drop it“一定丢了”,是对现在的猜测;should have dropped it“应该已经丢了”,不符合语境;had dropped it“以前丢了”,是过去完成时,不符合语境:must have dropped it“一定是丢了”,是对过去发生的事情的肯定猜测,符合句意,故本题选C。
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