前两句都正确,so和such常考的差异.
Mary's married a doctor是正确的,在此等于Mary has married a doctor,marry有“嫁、娶”的意思.句子的意思是：Mary已经嫁给了位医生.
当然你也可以说Mary is married to a doctor.
be married to sb和某人结婚.主要强调的是状态.例如：
Mary has been married to a doctor for two years.可以和一段时间连用,而marry就不行.