◎ 题干
When I try to understand ______ that prevents so many Americans from being as happy as one might expect,
it seemed to me that there are two causes.
[      ]
A. why it does
B. what it does
C. what it is
D. why it is
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“When I try to understand ______ that prevents so many Americans from being as happy as one might expect, it seemed to me that there are two causes. []A. why it…”主要考查了你对  【强调句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。