When I try to understand______that prevents so many Americans from being so happ

游客2025-03-10 7

问题 When I try to understand______that prevents so many Americans from being so 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

解析本题考查强调句型。本题是一个宾语从句为强调句型的复合句，被强调的部分是引导宾语从句的连接代词what，what同时担任强调句中it is的表语，故c正确。

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