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C. an; a
D. a; an 17. Rick has learned a lot about Chinese culture_______ he came to China. A. before
B. when
C. until
D. since 18.—Lily, why are you still here School has been over for half an hour. —Because I_______ my task yet. I still need one more hour. won't finish
B. didn't finish
C. haven't finished
D. don't finish 19. It's really a bad habit to listen to music while doing homework. _______ it is never too late for you to give it up. A. Instead
B. Anyway
C. Finally
D. Besides 20.—Have you got any information about your missing dog —_______. We are still looking for it. Not yet
B. I hope not
C. I think so
D. Of course 21.—I will miss my family when I go abroad for further study this autumn. —Don't worry. You can _____
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