单选题
英语运用能力测试
2011-10-19
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.
A．why it does
B．what it does
C．what it is
D．why it is
参考答案
C
答案解析
“it is．．．that”是强调结构，可先排除A、B两项。that从句中的prevents缺主语，排除D项。
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