------ ____ to live on land one day, where could he stay then? ------On the moon or under the sea, I think.
A. If man is forbidden
B. Should man be forbidden
C. If man forbade
D. When man has forbidden
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But for your advice, I ____ into trouble.
A. would get
B. got
C. might have got
D. should get
Thank you for giving me a hand, I ____ in the experiment without your valuable help.
A. had failed
B. will fail
C. would have failed
D. must have failed
If I ____ harder at school, I would be sitting in a comfortable office now.(2002.12.CET-4)
A. worked
B. were to work
C. had worked
D. were working
如果是浓雾天，驾驶员除了（）外几乎不能分辨其他颜色。
A. 绿色
B. 蓝色
C. 红色
D. 黄色
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