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
It is economically essential to make sure that this entire shipment of new ears ______ to the port on time.
A．would get
B．get
C．got
D．gets
单项选择题
They failed to pass the exam last time. I regretted ______.
A．being unable to help
B．to be not able to help
C．being not able to help
D．not be able to help
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