单项选择题

To reach a correct conclusion, they had debated the subject ______.

A．naturally
B．elegantly
C．at last
D．at length
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单项选择题
I think it is high time that Mr. Smith ______ his mind.
A．make up
B．makes up
C．made up
D．will make up
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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