题目内容
(请给出正确答案)
[单选题]
If we()now to protect the environment,well live to regret it.
A.won't act
B.don't act
C.Hadn't acted
D.haven't acted
![](https://lstatic.shangxueba.com/sxbcn/h5/images/tips_org.png)
A.won't act
B.don't act
C.Hadn't acted
D.haven't acted
第1题
We should pay attention________(protect) the environment.
第3题
A.should protect
B.must be protected
C.need protect
D.should protected
第5题
A.should
B.ought to
C.must to
D.dare
第6题
第7题
now)
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