问题：
Where ___________ live before you came here?
[ ]
A. did you used to
B. did you use to
C. use he to
D. he used to
Where ___________ live before you came here?
B. did you use to
C. use he to
D. he used to
[ ]
A. did you used to B. did you use to
C. use he to
D. he used to
参考答案：