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
You will be late ______ you hurry up.
#55421
A
after
B
when
C
unless
D
until
_______ Mr. Smith is not rich, ________he always gives money to the poor.
#56537
A
Although ; /
B
Although ; but
C
But ; although
D
Because; /
-- I’ll give the boys _____ to eat.        
#58550
A
something healthy
B
healthy something
C
anything healthy
D
healthy anything