—There _______ a factory here, but now it has changed into a big supermarket.
— You are so lucky to live here.
| A．used to have | B．is used to be | C．used to be | D．was used to be |
—There _______ a factory here, but now it has changed into a big supermarket.
— You are so lucky to live here.
| A．used to have | B．is used to be | C．used to be | D．was used to be |
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