is even more important is the earth cooled down, water began to appear on its surface.
#32975
A
When; that; when
B
What; whether; as
C
What; that; as
D
lt; whether; as
推荐题目
You shall get a film ticket free _______ you use your credit card twice this month.
#31867
A
until
B
since
C
if
D
unless
What an unforgettable experience! I’ll write it down ______ it is still fresh in my memory.
#31336
A
since
B
while
C
after
D
until
The manager raised his voice __________ he could be heard clearly.
#34072
A
in order to
B
in order that
C
so as to
D
make sure
I have a tight budget for the trip，so I'm not going to fly ________ the airlines lower ticket prices.(2012·上海，32)
#30443
A
once
B
if
C
after
D
unless