单项选择题

But you have to study hard, ______

A. mustn't you
B. won't you
C. don't you
D. oughtn't

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单项选择题

There is no rush now, for the game has been ______.

A. taken off
B. made out
C. called off
D. switched

单项选择题

I can hardly imagine Peter ______ across the Atlantic Ocean in 15 days.

A. sail
B. to sail
C. sailing
D. to have sailed

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