(2013·山东卷)There is no simple answer,________is often the case in science.
#66743
A
as 
B
that
C
when  
D
where
推荐题目
 _______ in the regulations that you shouldn't tell other people the password of your e-mail account.
#72633
A
What is required
B
What requires
C
It is required
D
It requires
 _________ get such a book?
#70361
A
Where do you think can I
B
Do you think where can I
C
Where do you think I can
D
Do you think where I can