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
He waited ________ the volcano became quiet and he was able to return two days later.
#80251
A
when
B
before
C
as
D
until
Helen has just heard the news from her father ________ her boyfriend David will come back soon.
#30074
A
when
B
how
C
which
D
that
I will accept Guy coming with us, ________ he pays for his own meals.
#30281
A
only if
B
so that
C
ever since
D
even though