________ is often the case, we have worked out the production plan.
#73180
A
Which
B
When
C
What
D
As
推荐题目
I try to understand __________ that prevents so many Chinese from being as happy as one might expect.
#72981
A
why is it
B
what is it
C
why it is
D
what it is
Xi’an was the last city ______ he visited when he came to China.
#70197
A
where
B
which
C
that
D
in which
