选A,it 在这里是一个形式主语,是为了避免头重脚轻,真正的主语是to take one hour's exercise every day
①选B,even可以修饰形容词的比较级
②选B,see sb.do sth跟动词原形表示看完整个动作的过程,若是跟动词 ing则是看到瞬间发生的动作,至于看没看完整个过程不确定.
( ) is necessary for us to take one hour's exercise every da
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