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
He went to the west to seek wealth and______.
A．destiny
B．fortune
C．future
D．fate
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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