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
— ______you write so well? —By reading and keeping diaries every day.
#85367
A
How is it
B
What is it
C
How is it that
D
What is it that
Was it in the house____he lived ____ the painting was stolen?
#85295
A
that, where
B
where, where
C
where, that
D
that, that