单项选择题

From 1970 to 1980 bicycle production increased （）

A．ten-folds
B．ten folds
C．tenfold
D．ten-fold

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单项选择题
But that he （） short of money at the time. He would have come to help us.

A．had been
B．was
C．has been
D．would be
单项选择题
Under this （）, we cannot choose but obey him.

A．circumstance
B．surrounding
C．situation
D．environment
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