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Pollution is a serious problem. Scientists have _____ some good ways to save it.
A.come up withB.come onC.come outD.come up
A

试题分析:句意:污染是个严重问题。科学家们想办法来解决她。A 想出来;B 加油;C 出版;D 走近;结合语境故选A。
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