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
The two old sisters,        so long, held each other and burst into tears.
#102459
A
being separated
B
having been separated
C
having separated
D
had been separated
He _____ on the bench, with his head down and his eyes _____ on the ground.
#103111
A
was seated; fixing
B
was seated; fixed
C
seated; fixing
D
seating; fixed