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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               
             
试题分析:考查动词短语辨析。Look up to尊重某人;live up to 不辜负;come up with 提出;keep up with 追赶。句意:科学家们正绞尽脑汁出解决问题的方案。根据句意所以选C项。            
考点 : 考查动词短语辨析
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