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
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单项选择题
At his jokes we could not help but （）

A. laugh
B. laughing
C. laughed
D. laughter
单项选择题
There’s ______ when we shall meet again.
A. not know



B. not to know
C. no knowing


D. never knowing
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