so,my elder brother,worked very hard at his study,and,my younger sister,did连词成句

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so,my elder brother,worked very hard at his study,and,my younger sister,did连词成句
so,my elder brother,worked very hard at his study,and,my younger sister,did连词成句

so,my elder brother,worked very hard at his study,and,my younger sister,did连词成句
my elder brotherworked very hard at his study,and so did my younger sister.

my elder brother worked very hard at his study,and so did my younger sister
或者 my younger sister worked very hard at his study,so did my elder brother.

My elder brother worked very hard at his study, and so did my younger sister.
要保持人称一致, 只有这样才是对的。