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

游客2023-11-15  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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