Question

I don't skate now,but I ________ when I was a kid.

Answer 1

答案A

used to do表示“过去常常干某事”,be/get/become used to doing表示“习惯于干某事”,be used to do sth.可被视作use的被动态,表示“被用来干某事”,used to的简略回答要保留to,后面动词可省去,D项要说I used to (do so).