2. 考研
  3. When I try to understand ______ that prevents so many Americans from being as happy as one might expect, it seems to me that the

When I try to understand ______ that prevents so many Americans from being as happy as one might expect, it seems to me that the

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问题 When I try to understand ______ that prevents so many Americans from being as happy as one might expect, it seems to me that there are two causes.
选项 A、why it does
B、what it does
C、what it is
D、why it is
答案C
解析 it is…that是强调结构，可先排除A、B两项。that从句中的prevents缺主语，排除D项。
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