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
They are living with their parents for the moment because their own house __________.
#101270
A
has been rebuilt
B
is being rebuilt
C
is rebuilt
D
has rebuilt
 He_____in a shower last night and got wet through. 
#104329
A
caught
B
wascaught
C
hadcaught
D
caughtup
Before taking the photo ,_______ the focus of the camera.
#101100
A
adopt
B
adjust
C
adapt
D
check
By the time I swa the angry expression on his face, I ______ exactly what I was having to face. But not for a moment _______ I should quit.
#104463
A
had known; I thought
B
have known; had I thought
C
would know; I would think
D
knew; did I think