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單項(xiàng)選擇題

It's not safe（）in the street.

A.to play
B.play
C.playing
D.plays

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If you（）stop smoking, you can only expect to have a bad cough.

A.won’t
B.wouldn’t
C.don’t
D.can’t

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It happened（）a winter night.

A.at
B.in
C.by
D.on

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