My wallet is nowhere to be found; ______ while I was on the bus.A、should I dropp

游客2023-09-23 13

问题 My wallet is nowhere to be found; ______ while I was on the bus.

选项 A、should I dropped it
B、I must have dropped it
C、I ought to have dropped it
D、I had been dropping

答案 B

解析 must have done表示对过去发生的事情的肯定判断。

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