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Theremanykindsofbirdsaroundhere,butnowweseldomseethembecauseoftheairpollution.[]A.usetoB.usetohaveC.usedtobeD.are
题目详情
| There _____ many kinds of birds around here, but now we seldom see them because of the air pollution. |
| [ ] |
| A. use to B. use to have C. used to be D. are |
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答案和解析
| C |
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