I must find out why____so many students made the same mistake. 
#84856
A
is it that
B
was it which
C
it is what
D
it was that
推荐题目
—What did he want to know,Anne?—_______I could finish writing the report.
#85161
A
When it was that
B
It was when that
C
It was when
D
When was it that
It was the President himself______ opened the door.
#84896
A
who     
B
when  
C
which
D
where
20.______ that caused him to serve dinner an hour later than usual.
#85520
A
It was we being late
B
It was our being late
C
It was we were too late
D
It was because we were late