When I try to understand ______ that prevents so many Americans from being as ha

游客2024-09-07 52

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、that it does
B、what it does
C、what it is
D、that it is

答案 C

解析宾语从句可由连接词that引导，但that仅起连接作用，常可省略。若连接词在句中兼起一个句子成分的作用，应用what。分析本题句子结构发现，连接词在句中作表语，故用what it is。

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