单项选择题

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

A. must drop
B. had dropped
C. must have dropped
D. should have dropped

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单项选择题
Copernicus maintained that the earth （） round the sun.

A. moves
B. moved
C. moving
D. move
单项选择题
My father did not go to New York; the doctor suggested that he （） go there.

A. not to
B. won’t
C. does not
D. not
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