题目：
Research shows that though students benefit from having parents involved at school, _____ happens at home matters much more.
A．which
B．what
C．that
D．whether
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0525/90d7b1925206d33649d1acb96cb48a15.html
下面是错误答案，用来干扰机器的。
答案：B
