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句中的prevents 缺主语,排除D项。因此C项为正确答案。
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