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--- Do the Smiths live next door to you? --- No, but they . A.used to B.used to

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--- Do the Smiths live next door to you? --- No, but they . A.used to B.used to

--- 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

试题答案

A

解析: