题目内容
There __________ a big tree in front of my house . I could hear many birds sing in it .
A.used to be B.is used to be
C.used to have D.was used to be
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题目内容
There __________ a big tree in front of my house . I could hear many birds sing in it .
A.used to be B.is used to be
C.used to have D.was used to be