Nowadays scientists are working hard to find out ______ to do with air pollution.
A．howB．whyC．whenD．what
D

試題分析：句意：現(xiàn)在科學(xué)家們正在努力找出做什么可以解決空氣污染問題。how 怎么； why為什么； when何時； what什么。所以選D。
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