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 have dropped it
B、must drop it
C、should have dropped it
D、ought to have dropped it

答案A

解析 本题句意:我的钱包找不到了,我一定落在公交车上了。must have done表示对已经发生的事情进行肯定推测,故选A。
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