52单词网 > 高中英语 > 高中英语题库 > Air pollution is really a big problem here, but nobody knows to do about it. [ ]

Air pollution is really a big problem here, but nobody knows to do about it. [ ]

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Air pollution is really a big problem here, but nobody knows to do about it. [ ]

Air pollution is really a big problem here, but nobody knows ________ to do about it.

[]

A．ifB．howC．whatD．whether

试题答案

答案：C

解析：

what作不定式to do的宾语．

标签：hereproblemnobodybutbig

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