Scientists are warning that ________ emissions of carbon (碳排放) are cut, we could be heading for an environmental disaster.
#30282
A
before
B
as
C
unless
D
in case
推荐题目
Brave New World describes a terrifying future _________ there is no war or violence and all the people can live happily.
#32079
A
where
B
which
C
that
D
whom
Our government has taken some measures to overcome the lack of electricity, but it may take some time _____ we have enough power．
#33827
A
since
B
after
C
unless
D
before
Bill shows no interest in painting, there’s no sense in inviting him to the art show.
#31313
A
As if
B
Now that
C
Even if
D
So long as
Some house plants grow better if placed near a window with plenty of sunlight ______ others prefer to be in a more shaded spot.
#31254
A
unless
B
since
C
when
D
while
It was______ your timely help that we accomplished the task on time.（2010·01·山西运城检测）
#32977
A
Because
B
thank
C
thanks to
D
as