The scientists are beating their brains, trying to ______ a solution to the problem.

A. look up toB. live up toC. come up with D. keep up with

 

C

【解析】

試題分析：考查動(dòng)詞短語(yǔ)辨析。Look up to尊重某人；live up to 不辜負(fù)；come up with 提出；keep up with 追趕。句意：科學(xué)家們正絞盡腦汁出解決問(wèn)題的方案。根據(jù)句意所以選C項(xiàng)。

考點(diǎn) : 考查動(dòng)詞短語(yǔ)辨析

 

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