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
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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
单项选择题
It may be worthwhile at this moment to ______ and see what results we have got after one year's experiments.
A. look back
B. look around
C. look up
D. look forward
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