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

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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 句意:当我试图弄明白到底是什么妨碍如此多的美国人如愿以偿地获得快乐的时候,我发现好像有两个原因。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。如果把连接代词what换成一个名词,句子结构便一目了然了:It is the inflation that prevents so manyAmericans from being so happy as they might expect.据此分析不难看出C对。
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