选择合适的句子补全对话。
Liu: Were you at this school thirty years ago?
Wu: Yes. I was.
1．Liu: Was there a library?
Wu.
2． But there weren’t so many books in it.
Liu: Were there any trees?
Wu:
3． Look, they are still here.
Liu:
4．Wu: No. there wasn’t.
Liu: How many students were there at that time?
Wu:
5．| A．About six hundred students. |
| B．Yes there were. |
| C．But the school was small at that time. |
| D．Yes. there was. |
| E．Was there a computer room thirty years ago? |
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