【单选题】

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

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根据网考网移动考试中心的统计，该试题：

6%的考友选择了A选项

15%的考友选择了B选项

72%的考友选择了C选项

7%的考友选择了D选项

My watch is nowhere to be found. I ______ when I was on the bus.A．must drop it