----What’s the matter with you and your friend?----She looks very busy. I want to help her, but I don’t know .A. how to do B. what to do itC. what to do D. why to do 题目和参考答案——青夏教育精英家教网—

题目内容

----What’s the matter with you and your friend?

----She looks very busy. I want to help her, but I don’t know _____.

A. how to do B. what to do it

C. what to do D. why to do

【解析】

试题分析：句意：——你和你朋友怎么啦？——她看起来非常忙。我想帮助她，但是我不知道怎么做。此处作为动词know的宾语从句，do是及物动词，需要接代词作宾语，why和how是疑问副词，不能作宾语，故排除AD两项。故用代词what充当do的宾语。B项中it和what都是do的宾语，重复了，故排除。故选C。

考点：考查宾语从句的用法。

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