when did you start skating?

问题描述:

when did you start skating?
a,since i was five b since five years ago
c when i was six d for six years
选哪个,为什么?

C
A 如果用Since 则主句应用完成时 这儿是过去时
B 五年前不用Since搭配 直接说 five years ago 就可以了
D 答非所问 问的是什么时候开始的 答的是有六年了 不符合逻辑