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第1题

Silk __________ by Chinese for thousands of years now.A. has used B. has been used C. was used D. is used
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第2题

When we were having a meeting, the director _________ the bad news by telephone.A. was telling B. was told C. could tell
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第3题

All the team members tried their best. We lost the game, _________.A. however B. thereforeC. since C. as
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第4题

I prefer classic music __________ pop music.A. than B. on C. with D. to
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