单项选择题

Children don't ______ understand what are reciting, but gradually it will have in impact on thinking.

A. necessarily
B. profitably
C. unnecessarily
D. unprofitably
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单项选择题
The professor went into the topic ______ so that we all can understand it.
A. in details
B. at hand
C. in summary
D. in turn
单项选择题
We have to hurry up since we have no ______ time to finish it.
A. sufficient
B. additional
C. efficient
D. consequent
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