I really don't know ____ next.Can you tell me A.how to do B.what to do A为什么错了?He did not know how to do about it.这句话正确吗?

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I really don't know ____ next.Can you tell me A.how to do B.what to do A为什么错了?He did not know how to do about it.这句话正确吗?
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I really don't know ____ next.Can you tell me A.how to do B.what to do A为什么错了?He did not know how to do about it.这句话正确吗?
I really don't know ____ next.Can you tell me
A.how to do B.what to do
A为什么错了?
He did not know how to do about it.这句话正确吗?

I really don't know ____ next.Can you tell me A.how to do B.what to do A为什么错了?He did not know how to do about it.这句话正确吗?
do是及物动词,如果用how to do,则要加it或that,让它做do的宾语.否则要用what to do、

A。how to do it

我觉得是B错了。。。绝对是B错了。。。
如果一定要说A错在哪里的话。。。应该是How to do sth(something)吧?

这里的next是副词,意为接下来、然后
如果选A的话,do后面一定跟一个名词,意为怎样做这件事。比如how to do the next,这里的the next就是个名词,解释为下一步。
what to do next就相当于 to do what next 句子当中就不缺少do后面的内容。

how to do sth / what to do 前者一定要加sth

how to do 后要加something 例如I don‘t know how to do it .

know后边缺少宾语。这里的用法是“疑问代词+不定式 ”当宾语。

how 是提问方式的副词,不能作do的宾语

next在这儿是一个副词,“接下来,下一步”的意思。你说的答案用还原法验证更容易理解一些。do what "做什么"---what 是do 的宾语,因为do是一个及物动词;do it ‘做它’,A.how to do 中因为how是副词,所以do就少了宾语,加上it,就对了。how to do it=what to do...

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next在这儿是一个副词,“接下来,下一步”的意思。你说的答案用还原法验证更容易理解一些。do what "做什么"---what 是do 的宾语,因为do是一个及物动词;do it ‘做它’,A.how to do 中因为how是副词,所以do就少了宾语,加上it,就对了。how to do it=what to do

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你把what to do看做to do what,就行了

know为动词,后应为宾语,做宾语用what而不用how

A和B选项都构成宾语从句。A选项中do是既无动词,后面必须跟宾语,就是sth.如果把A选项改成“how to do it”,那么A也是正确的。而B选项中what引导宾语从句,且在从句中充当do的宾语,所以B选项是正确的。

要填 what to do
要选how to do 的话后面要带 it / that
how to do it/that

how to do it.
do是及物动词