When I try to understand ______that prevents so many Americans from being as hap

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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 them are two masons.

选项 A、why it does
B、what it does
C、what it is
D、why it is

答案 C

解析考查it is…that强调句型。本题understand后面的从句作宾语，由what引导，同时，what在强调句中作prevents的逻辑主语。由以上分析可见，选项C为正确答案。

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