______ was most important to her, she told me, was her family.

A.It

B.This

C.What

D.As

答案及解析： 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。