问题补充：
Did you sing a song Yes,i sing.I sang a chinese song 划线部分哪里错了?A是（Did you sing a songA是（Did you sing a song）里的song B是(Yes,i sing.I sang a chinese song )l里的singC是(Yes,i sing.I sang a chinese song )里的san
答案：
B是(Yes,i sing.I sang a chinese song )l里的sing改成did
应该是yes I did.
）======以下答案可供参考======
供参考答案1:
显然B，回答过去时，用sang...
供参考答案2:
B
