______ was most important to her, she told me, was her family.
A.ItB.ThisC.WhatD.As在线课程C
解析：
本题考查主语从句的连接词。what在主语从句中作主语，相当于the thing that。she told me为插入语。A和B项不能用来引导主语从句。D．as意为“正如，就像”，常用来引导定语从句。故选C。