◎ 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
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“英汉互译。1. icecream ______________ 2. goshopping______________3. teashop ______________ 4. 放风筝 ______________5. 读书 ______________…”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。