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

问题补充：

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

A. As

B. It

C. This

D. That

答案：

A. As

(答案→)B. It

C. This

D. That

解析：句意：医疗保障方面的进步将使国家更强大与繁荣（这一观点）是我们的信念。这里it 作形式主语, 后面的that 引导真正的主语从句，选B。