When did you start to play the piano A.For two years B.Since two years ago C.Since I was tenD.When I was ten,请说明理由,

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When did you start to play the piano A.For two years B.Since two years ago C.Since I was ten
D.When I was ten,请说明理由,

ABC都是表示的时间段,要用how long提问
when提问的话,问的是时间点

D

a 是回答how long
bC是回答完成时的
d是答案 用when回答when

D,它问的是一般过去式,指过去,是短动作。不能用for和since,它们指从过去到现在。