Mary is his student .She plays the violin very well.（单复数变换并改成过去式,将两句合并成一句）（ ） （ ）Mary and Alice ( ) the( )very well ten years( )按这个句子填！
问题描述：
Mary is his student .She plays the violin very well.（单复数变换并改成过去式,将两句合并成一句）
（ ） （ ）Mary and Alice ( ) the( )very well ten years( )按这个句子填！
答
Mary who played the violin very well was his student.
答
they were their students who played violin very well
答
Mary was once one of his students who palyed the violin very well.
答
Mary is one of his students who plays the violin very well