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

游客2023-10-17 57

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

答案 B

解析本题考查名词性从句和强调句。what引导的名词性从句作动词understand的宾语，宾语从句是一个it is…that的强调句型，that句中的prevents缺少主语，故选B。

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