Air pollution is getting more and more serious, so we must take action ________ it is too late.
#30412
A
before
B
after
C
until
D
when
推荐题目
Jack was halfway back to the village where his mother lived _____ Mary caught up with him.
#31859
A
when
B
while
C
until
D
though
well prepared you are，you still need a lot of luck in finding a suitable job．
#30191
A
However
B
Whatever
C
No matter
D
Although
He was very tired，and________he didn’t give the market report.
#31908
A
otherwise
B
besides
C
however
D
therefore
you are so eager to join the school basketball team, why not try out for it?
#31231
A
While
B
Now that
C
Though
D
Unless
He was sentenced to death ______ what he has stolen from the bank.
#80520
A
that
B
since
C
because
D
because of