is our belief that improvements in health care will lead to a stronger, more prosperous economy.
A. As
B. That
C. This
D. It
网友回答
A. As
B. That
C. This
(答案→)D. It
解析：D【命题立意】考查it的用法。
【解题思路】根据句子结构可知,that引导的从句为主语从句，作句子的真正主语，因此前边应有形式主语，而形式主语只能用it，不能用this或that。