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Nowadays scientists are working hard to find out ______ to do with air pollution.

A. howB. whyC. whenD. what

 

D

【解析】

试题分析:句意:现在科学家们正在努力找出做什么可以解决空气污染问题how怎么; why为什么; when何时; what什么。所以选D。

考点:考查疑问词。

 

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