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Pollution is a serious problem. Scientis...

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

 

A 【解析】 试题分析:句意:污染是个严重的问题。科学家已经想出了解决它的好办法。A想出B快点C出版D走上前。根据句意,故选A。 考点:考查固定词组的用法。  
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