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 此处是强调句结构it is(what)that prevents so many Americans from being as happy as one might expect. . .
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