问题
选择题
The scientists are beating their brains, trying to ______ a solution to the problem.
A．look up to
B．live up to
C．come up with
D．keep up with
答案
C
题目分析：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