We don't know ( ) they did it.A.how B.who C.what D.which

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We don't know ( ) they did it.A.how B.who C.what D.which
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We don't know ( ) they did it.A.how B.who C.what D.which
We don't know ( ) they did it.
A.how B.who C.what D.which

We don't know ( ) they did it.A.how B.who C.what D.which
how
这是一个考查宾语从句的题目,括号以及后面部分做know的宾语
在宾语从句中,除了that,if ,whether不做句子成分外,其他的引导词都要充当句子成分
这道题目中they did it 分别是主语,谓语和宾语,所以不用what,who,而which 做引导词通常是和后面的名词一起出现的,所以选A,我们不知道他们是怎么做的
which做引导词的给你一个例子
I do not know which book is better.

A 我们不知道他们是怎么做的。

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选择A 我们不知道他是如何做的 they did it 是个完整的句子 不缺成分了, 有疑问请追问

选A 因为后面已经是一个句子了,所以要用方式状语how,如果要用what,就要改成what they did

A,不知道他们是如何做到的