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_______ is our belief that improvements in health care will lead to a stronger, more prosperous economy.

A.As B.That C.This D.It

D

解析试题分析:通过分析句子结构,可知这个句子中包含一个主语从句,且主语从句位于句末,故用形式主语It。
考点:it用作形式主语
点评:It用作形式主语 ,替代作主语的从句、动词不定式、动名词,而把真正作主语的从句、动词不定式、动名词置于句尾。需要注意形式主语和形式宾语,只能用It,而不能用其它。

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