when did you start to play tennis?A.when I was ten b.since two years ago为什么

问题描述:

when did you start to play tennis?A.when I was ten b.since two years ago为什么

A. when did you start 是过去式,since与完成时连用。

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不明白的再问哟,请及时采纳,多谢!

A.when I was ten 当我10岁时,用过去时
B.since two years ago 自从2年前以来,用现在完成时
所以选A