单项选择题

Mary has got a full mark in the test. She（）very hard all these days.

A．will work
B．may work
C．must have worked
D．could have worked

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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

（）is often the case, one third of the workers have over-fulfilled the production plan.

A．What
B．This
C．That
D．As

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