The scientists are beating their brains, trying to a solution to the problem.A. look up

发布时间：2020-08-17 08:20:23

The scientists are beating their brains, trying to      a solution to the problem.
A. look up to
B. live up to
C. e up with
D. keep up with

网友回答

A. look up to
B. live up to
C. e up with
D. keep up with
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