单项选择题

We must try our best to lower the cost of our products. Otherwise the high cost will______our profit.

A．cut off
B．cut in
C．cut short
D．cut into
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单项选择题
He ran quickly to the classroom, two books______under his arm.
A．to be hold
B．held
C．were held
D．holding
单项选择题
Although this area is very poor just now, its______wealth is great.
A．previous
B．profound
C．potential
D．primary
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