题干
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
答案(点此获取答案解析）
A
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
