问题
选择题
| There _____ many kinds of birds around here, but now we seldom see them because of the air pollution. |
A. had B. used to have C. used to be D. are |
答案
答案：C
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| There _____ many kinds of birds around here, but now we seldom see them because of the air pollution. |
A. had B. used to have C. used to be D. are |
答案：C