______ is our belief that improvements in health care will lead to a stronger, more prosperous economy.
A．Which B．What C．It D．As
______ is our belief that improvements in health care will lead to a stronger, more prosperous economy.
A．Which B．What C．It D．As
C
【解析】
考查it的用法。句意：医疗保健的进步将促进一个更强大、更繁荣的经济，这是我们的信念。that引导的是主语从句，故空格处应该用it作形式主语，代替真正的that引导的主语从句。故选C。
【名师点睛】
It作形式主语代替主语从句，主要是为了平衡句子结构，主语从句的连接词没有变化。
2.用it 作形式主语代替主语从句的结构
(1)It is ＋名词＋从句
It is a fact that … 事实是…
It is an honor that …非常荣幸
It is common knowledge that …是常识
It’s a pity that you missed the exciting football match.
多么可惜啊，你错过了一场精彩的足球比赛。
(2)It is ＋形容词＋从句
It is natural that… 很自然……
It is strange that… 奇怪的是……
It is uncertain whether he can come to Jenny’s birthday party or not.
他来不来参加简的生日派对，这个不确定。
(3)It is ＋不及物动词＋从句
It seems that… 似乎…
It happened that… 碰巧…
It seemed that he didn’t tell the truth.
似乎他没有讲真话。
It happened that I was out when he called.
碰巧，他打电话的时候我在外面。
(4)It ＋过去分词＋从句
It is reported that… 据报道…
It has been proved that… 已证实…
It is reported that 16 people were killed in the earthquake.
据报道，在这场地震中，有16人遇难。