I really don't konw_____ A how to do B what to doC what should I do

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I really don't konw_____ A how to do B what to doC what should I do
I really don't konw_____ A how to do B what to do
C what should I do

I really don't konw_____ A how to do B what to doC what should I do
b
我真的不知道该干什么
a hot to do 后面应该加宾语
c 应该为what I should do

B
如何是A的话,需要加宾语how to do it

b
选a应该改为how to do that

B

B
A改为how to do it/that.也对
C 语序不对,改为what I should do也对

b

b
绝对的

B
What 做 do 的宾语
而How不能做宾语
只有加it才完整

选B
如果选A 应该是how to do it
如果选C 应该是 what I should do,宾语从句用陈述句语序