My wallet is nowhere to be found. I ______ when I was on the bus.A、must have dro

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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

解析本题测试情态动词。“must have done”表示对已发生的事情进行肯定推测。本句的意思是：“我的钱包找不到了。我一定是在公共汽车上掉的。”

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Mywalletisnowheretobefound.I______whenIwasonthebus.A、mustdropitB、