The scientists are beating their brains, trying to ______ a solution to the problem. A. look up toB....
2022-11-24 13:36:14 19次 2015届浙江省高二下学期期始考试英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
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
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