【題目】I just don’t understand _______ that prevents so many Americans from being as happy as one might expect.

A. why it does B. what it does

C. what it is D. why it is

【答案】C

【解析】試題分析：分析句子結(jié)構(gòu)可知understand后是強(qiáng)調(diào)句的特殊疑問句形式，“我就是不明白是什么阻止了這么多美國人過得快樂”，“what is it that prevents...”是強(qiáng)調(diào)句的特殊疑問句，作動詞understand的賓語，要用陳述句語序，故選C。

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