单项选择题

A couple of minutes earlier,（）we could hve been able to hear his speech.

A. and
B. on
C. but
D. so

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单项选择题

I think you have talked too much; what you need now is more action and（）talk.

A. few
B. less
C. fewer
D. little

单项选择题

I'd rather that you（）the operation right away.

A. perform
B. should perform
C. will perform
D. performed

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