When I try to understand （）that prevents so many Americans from being as happy as oneexpects， it see
考试：
科目：（在线考试）
问题：
A：why it does
B：what it does
C：what it is
D：why it is
答案：
解析：
【解析】（）that prevents so many Americans from being as happy as oneexpects表达是underetand的宾语从句，该从句的主语是what,谓语是prevents,意思是“什么阻止了……”；但为了对what进行强调，此处对从句主语what使用了强调句型it is what thatprevents...,考虑到what具有从句引导词的作用，它必须置于从句句首与前面的understand形成对接，于是语序进而调整为wha it is that prevents...,故本题答案选C。
A、B和D代入句中均不能形成语义和结构完整的句子。
【点睛】本题目是强调句型It is...that...对“从句主语（what)”进行强调。
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When I try to understand （）that prevents so many Americans from being as happy as oneexpects， it see
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