问题
选择题
There _______ a lot of trees here, but now it has become desert. [ ]
A. is
B. are
C. used to be
D. used to being
答案
答案：C
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There _______ a lot of trees here, but now it has become desert. [ ]
A. is
B. are
C. used to be
D. used to being
答案：C