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

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

答案C

解析 在A,B两个选项中,谓语动词do与其后的宾语that从句意思不同;D项中的why不能作句子的表语,只有C项的what符合要求。
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