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

发布时间：2020-08-15 02:49:25


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

网友回答

(答案→)A. used to
B. used to do
C. used to doing
D. used to be
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