Question

Where ___________ live before you came here?

1. A.
   did you used to
2. B.
   did you use to
3. C.
   use he to
4. D.
   he used to

Answer 1

B
考查used to。该结构的特殊疑问句形式，用特殊疑问词+did+主语+动词原形？故选B.