My wallet is nowhere to be found. I______when I was on the bus.A、must have dropp

游客2024-10-16 9

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

解析情态动词题。must have done是对过去事实的肯定猜测，A符合句意。must do表示“一定做，必须做某事”，should have done和ought to have done都表示“过去应该做而实际上没有做”，故均不符合句意。

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