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

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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 语法题。本题是一个宾语从句为强调句型的主从复合句,句子结构难度较大。在这个强调句子中,被强调的部分是引导宾语从句的连接代词what,这个连接代词what同时担任强调句中it is的表语(注意:在变强调句之前的原句中,这what是主语。)如把连接代词what换成一名词句子结构便一目了然了:It is the inflation that prevents so many Americansfrom being so happy as they might expect.据此分析不难看出C对。
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