The building_______ be a factory, but now it_______ a shopping centre.
| A．used to; is used as | B．is used to; used to be |
| C．used to; used to be | D．is used to; is used as |
The building_______ be a factory, but now it_______ a shopping centre.
| A．used to; is used as | B．is used to; used to be |
| C．used to; used to be | D．is used to; is used as |
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