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题目内容
（赤峰学院-综合英语I(专升本)）
18. (单选题) My wallet is nowhere to be found.I（ ）it when I was on the bus.(本题3.5分)
A、 must drop
B、 should have dropped
C、 had dropped
D、 must have dropped
A、 must drop
B、 should have dropped
C、 had dropped
D、 must have dropped
参考答案