I don’t know _____ he will be back home.
#33403
A
who
B
what
C
when
D
where
推荐题目
The boy was so tired that he fell asleep ______ his mother could take off his clothes．
#32555
A
before
B
after
C
while
D
when
He, an average citizen, always thinks of_____ he can do more for the people．
#31996
A
how
B
why
C
what
D
which
—How long do you think it will be ________ we win the football World Cup? —Perhaps twenty years.
#33546
A
when
B
since
C
that
D
before
.---Susan, what are you talking about?----_____I can finish writing the report on time.
#34718
A
If
B
When
C
Whether
D
What