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

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

出自：赤峰学院-综合英语I(专升本)

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