If we         now to protect the environment, we’ll live to regret it.
#53390
A
hadn't acted
B
haven't acted
C
don't act
D
won't act
推荐题目
 She ________ a model before she _______ a superstar.
#54030
A
have been, became
B
had been, become
C
had been, became
D
has been, become
I was____late to catch a bus after the party,and we called a taxi
#58585
A
too very
B
much too
C
too much
D
far
Great changes __________ in my hometown in the last five years.
#52677
A
took place
B
have been taken place
C
had been taken place
D
have taken place