Pollution is a serious problem. Scientists have _____ some good ways to save it. A. come up with B. ...
2023-01-27 02:19:41 22次 2015届辽宁凌海石山初级中学初二下第一次月考英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Pollution is a serious problem. Scientists have _____ some good ways to save it.
A. come up with B. come on C. come out D. come up
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