问题
选择题
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
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. use to
B. use to have
C. used to be
D. are
答案：C