Do the Smiths live next to you?No,but they ().a.used to b.used to do it c.used to be d.used选哪个,为什么详细点 如果是used to do对吗,

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Do the Smiths live next to you?No,but they ().a.used to b.used to do it c.used to be d.used选哪个,为什么详细点 如果是used to do对吗,

A
used to do sth 过去常常做某事
这里省略了括号部分used to ( live next to me)

A,是省略,but they used to live next to me.
used to do 不对

答案C
used to be 过去是
used to do 过去常常做某事