单项选择题

My watch is nowhere to be found. I ()when I was on the bus.

A. must drop it
B. might drop
C. must have dropped it
D. should have dropped it.

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The story ()many years ago.

A. take place
B. took the place
C. took place
D. happen
单项选择题
Stop making so much noise, for you are () me in my studies.

A. attracting
B. disturbing
C. contracting
D. contacting
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