----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

 

C

【解析】

試題分析：句意：——你和你朋友怎么啦？——她看起來非常忙。我想幫助她，但是我不知道怎么做。此處作為動(dòng)詞know的賓語(yǔ)從句，do是及物動(dòng)詞，需要接代詞作賓語(yǔ)，why和how是疑問副詞，不能作賓語(yǔ)，故排除AD兩項(xiàng)。故用代詞what充當(dāng)do的賓語(yǔ)。B項(xiàng)中it和what都是do的賓語(yǔ)，重復(fù)了，故排除。故選C。

考點(diǎn)：考查賓語(yǔ)從句的用法。

 

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