She looks very sad. I want to help her , but I just don’t know_________ to do.
#38443
A
what
B
when
C
how
D
where
推荐题目
 _     ____ and I will hit you.
#37568
A
If you say that again  
B
Say that again
C
Say you that again  
D
You’ll say that again
—We can use QQ to talk with each other on the Internet.—Really? But can you tell me _______it.
#38190
A
how I can use
B
how can I use
C
why can I use
D
when I can use