I try to understand that prevents so many Chinese from being as happy as one might expect.
A. why is it
B. what is it
C. why it is
Dwhat it is
网友回答
A. why is it
B. what is it
C. why it is
(答案→)D. what it is
解析：主要测试宾语从句。强调句句式中的疑问词要提前。译文：我试着理解究竟是什么不能让如此多的中国人向人们所期望的一样快乐。