题文
---Do the Smiths live next door to you?
---No, but they________.
| A．used to | B．used to do |
| C．are used to | D．used to be |
---Do the Smiths live next door to you?
---No, but they________.
| A．used to | B．used to do |
| C．are used to | D．used to be |
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