______ is our belief that improvements in health care will lead to a stronger, more prosperous economy.
A.As
B.That
C.This
D.It
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D解析句意：我们相信医疗方面的改善可以使经济更加繁荣。that improvements in health care will lead to a stronger, more prosperous economy引导的句子为真正的主语，it为形式主语。考生因无法辨认that从句是主语从句，误选其他选项。此题不仅考查代词的用法，而且还涉及名词性从句的内容。所以我们在备考中一定要前后兼顾，把各种知识综合在一起，才能在考试中胜券在握。