题目内容
There ________ a small pool in front of our house．But now it's a small park．
[ ]
A．used to have
B．was used to be
C．used to be
D．used be
答案：C
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题目内容
There ________ a small pool in front of our house．But now it's a small park．
A．used to have
B．was used to be
C．used to be
D．used be