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题目内容
（河南商丘师范学院幼儿英语(专升本)）
My watch 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
ought to have dropped it
A
must drop it
B
should have dropped it
C
must have dropped it
D
ought to have dropped it
参考答案