分类：教育/科学-学习帮助
问题：单项选择19______mattersis______peopl 
______ matters is  ______ople think and talk about over weeks and even months ahead.A. It, what    B.What ,that    C. That, how    D. What ,what
回答：D

第一个what是主语。
第二个what引导的是表语从句，在从句中作think和talk about的宾语。

不是固定搭配，而是复合句的用法。上面的答案有些不妥。