He started to learn the piano when he was seven改为同义句

问题描述:

He started to learn the piano when he was seven改为同义句
He started to learn the piano ____ ____ ____ _____seven四个空

He started to learn the piano at the age of sevenHe started to learn the piano ____ _____________seven四个空at the age of啊,呵呵,上面不是正好四个空吗。。。。。看差了