Kids are not allowed to leave kindergartens _____ their parents come to pick the
题型：北京期末题难度：来源：
| Kids are not allowed to leave kindergartens _____ their parents come to pick them up. |
A. since
B. unless
C. although
D. because |
答案
举一反三
| I couldn"t say I didn"t like something, whatever it might be, _____ I tried it. |
A. until after
B. ever since
C. so that
D. long before |
| Experts are trying to work out a solution to save the miners _____ its too late. |
A. before
B. since
C. unless
D. when |
| _____ I know little about architecture, I find that building very impressive. |
A. Since
B. As
C. While
D. If |
| I think you should complain _____, of course, you are happy with the way things are. |
A. if
B. unless
C. as
D. because |
| I ____ him ____ he left school. |
A. have recognized; since
B. have known; since
C. had recognized; before
D. had known; after |
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