30．--- Do the Smiths live next door to you? --- No but they.A. used toB. used to doC. use

问题补充：

30．--- Do the Smiths live next door to you?

--- No, but they.

A. used to

B. used to do

C. used to doing

D. used to be

答案：

(答案→)A. used to

B. used to do

C. used to doing

D. used to be

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