(2010·上海)Wind power is an ancient source of energy ________ we may return in the near future.
#30491
A
on which
B
by which
C
to which
D
from which
推荐题目
Please tell me ______ you are getting on with your new classmates.
#30998
A
whether
B
how
C
what
D
where
It is hard for the Greek government to get over the present difficulties_____ gets more financial support from the European Union.
#30125
A
if
B
unless
C
because
D
since
________our manager objects to Tom's joining the club，we shall accept him as a member.
#30063
A
Until
B
Unless
C
If
D
After
You cannot take back your words _________ they are out of your mouth.
#30113
A
before
B
whether
C
once
D
while