单选题：My wallet is nowhere to be found. I__________ when I was on

题目内容：

My wallet is nowhere to be found. I__________ when I was on the bus. A．must drop it
B．should have dropped it
C．must have dropped it
D．had dropped it

参考答案：

答案解析：

I don't think this problem is above your ability. I think y

I don't think this problem is above your ability. I think you can__________ it.

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