When I try to understand （）that prevents so many Americans from being as happy as oneexpects， it see
考试：MBA考试
科目：英语（在线考试）
问题：
A：why it does
B：what it does
C：what it is
D：why it is
答案：
解析：
相关标签：
When I try to understand （）that prevents so many Americans from being as happy as oneexpects， it see
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