问题
选择题
There _______ some trees around the house. Now, there's nothing. [ ]
A. used to have
B. used to be
C. are used to have
D. use to be
答案
答案：B
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There _______ some trees around the house. Now, there's nothing. [ ]
A. used to have
B. used to be
C. are used to have
D. use to be
答案：B