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 |
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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