is our belief that improvements in health care will lead to a stronger more prosperous ec

问题补充：

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

A. As

B. That

C. This

D. It

答案：

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。