38. (单选题) My watch is nowhere to be found. I _____ when I was on the bus.(本题2.0分) A、 must drop it B、 should have dropped it C、 must have dropped it D、 ought to have dropped it

38. (单选题) My watch is nowhere to be found. I _____ when I was on the bus.(本题2.0分)
A、 must drop it
B、 should have dropped it
C、 must have dropped it
D、 ought to have dropped it

出自：长春工程学院-大学英语4(专升本)

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