Nowadays scientists are working hard to find out ______ to do with air pollution.A．howB．whyC．whenD．what-初中英语-n多题

◎ 题干

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

A．how

B．why

C．when

D．what

◎ 答案

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◎ 解析

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◎ 知识点

根据n多题专家分析，试题“Nowadays scientists are working hard to find out ______ to do with air pollution.A．howB．whyC．whenD．what…”主要考查了你对【助动词】，【介词短语】，【固定搭配】，【疑问词组】等知识点的理解和应用能力。关于这些知识点的“档案”，你可以点击相应的链接进行查看和学习。

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