It isn’t clear_____ is to blame.We need to find a solution to the problem first.
#85098
A
who is it that
B
who it is that
C
it is who that
D
that who it is
推荐题目
It was ______ back home after the experiment. 
#85256
A
not until midnight did he go
B
until midnight that he didn’t go
C
not until midnight that he went
D
until midnight when he didn’t go