单项选择题

The production of our new model is to go up ______ 8.6 percent this year.

A．at
B．by
C．in
D．with
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单项选择题
We are told that the order has not yet come, so we have nothing to do now but ______.
A．wait
B．to wait
C．to be waiting
D．waiting
单项选择题
The experiment is not satisfactory and its data is doubtful; we'll have to do it ______ time.
A．second
B．the second
C．a second
D．this second
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