问题

They don’t know _______ their parents are.
A:that
B:what
C:why
D:which
B:what
C:why
D:which
正确答案是:
同类题型
The girl can _________ English and she can _________ it in English very well.
I wonder ________ Mary has changed so much.— She has been suffering a serious disease.
My grandfather loves keeping pets.He said a pet could help a person feel______.A.more nervous
It looks _______ it were going to rain.
_______ we start thinking and believing we can do it, anything is possible.[ ]