—I hear that Huang Gang made an English speech contest last week.-and .A. So did he,so

—I hear that Huang Gang made an English speech contest last week.
--- and .
A. So did he,so did you.
B. So he did, so you did.
C. So did he,so you did.
D. So he did ,so did you.

A. So did he,so did you.B. So he did, so you did.C. So did he,so you did.(答案→)D. So he did ,so did you.解析：so引导的倒装句，其结构有两种：一是so+主语{与上文是同一个人}+助动词或情态动词或be动词，表示上文的那个人的确是这样的，或so+助动词或情态动词或be动词+主语{与上文不是同一人}表示另一个人也是这样。根据句子意思和语境，故选D

就是这个解释