The rivers will become dirtier and dirtier _______ we take action to protect them.
#55533
A
since
B
if
C
until
D
Unless
推荐题目
________my mother is very tired after a whole day’s hard work, she tries to spare time for me.
#56558
A
Every time
B
Whenever
C
Even though
D
As
—Tom isn’t feeling very well. —He seems to have a cold the weather changes suddenly.
#55789
A
before
B
so
C
because
D
if
—Most people said the film Let The Bullets Fly was wonderful _____ they watched it.—I agree with them, and I like it very much!
#58083
A
before
B
if
C
since
D
after
--- Let’s go fishing if it _____ this weekend . --- But nobody knows if it ____.
#57985
A
is fine , will rain
B
will be fine , rains
C
will be fine , will rain
D
is fine , rains