单项选择题

Vegetables are cheap ______ when they are in season.

A. buying


B. to buy
C. to be bought


D. to buy them
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单项选择题
The sale usually takes place outside the house, with the audience ______ on benches, chairs, or boxes.
A. having seated


B. seating
C. seated



D. having been seated
单项选择题
At his jokes we could not help but （）

A. laugh
B. laughing
C. laughed
D. laughter
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