题目内容：

合并含非限制性定语从句的复合句 He has tow sons.Both of them are doctors
he must from Africa.It can be seen from his skin
She is a teacher of much knowledge.Much can be learned from her
I remember the day."The beatles "played their first hit one that day

优质解答

He has two sons,both of whom are doctors.
He must come from Africa,as can be seen from his skin.
She is teacher of much knowledge,from whom much can be learned.
I remember the day,when "The beatles "played their first hit .