Every possible means _______ to prevent the crash , but the computer doesn’t still work．
#4644
A
is used
B
are used
C
has been used
D
have been used
推荐题目
It is generally believed that teaching is ___________it is a science.
#4916
A
an art much as
B
much an art as
C
as an art much as
D
as much an art as
_________ the flight to New York will be delayed is _________ I’m especially worried about.
#4625
A
If; what
B
Whether; that
C
When; that
D
Whether; what
--- Would you mind if I closed the door ? --- ___________．The wind is blowing strongly．
#4641
A
Certainly
B
No
C
Yes , you can’t
D
I’m sorry but you’d better not
It is re ported that the United States uses _____ energy as the whole of Europe.
#4928
A
as twice
B
twice much
C
twice much as
D
twice as much