题干
_____ they _____ to go to the park when they were children?
A：Did, use
B：Did, used
C：Do, used
D：Do, use
答案(点此获取答案解析）
A
_____ they _____ to go to the park when they were children?
A：Did, use
B：Did, used
C：Do, used
D：Do, use
