If we _________ now to protect the environment, we’ll live to regret it. 
#100580
A
hadn’t acted
B
haven’t acted
C
don’t act
D
won’t act
推荐题目
Bob ________ with us together since he came to our school.
#101237
A
have worked
B
has worked
C
worked
D
will work
I promise that everything __________ clear about it next week.
#101341
A
has made
B
has been made
C
will be made
D
will make
Edward, you play so well. But I ________ you played the piano.
#104527
A
didn’t know
B
hadn’t known
C
don’t know
D
haven’t known