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________ in the school regulations that students should not wear long hair or jewels.
A.It is requiredB.What is required
C.What requiresD.It required
A

试题分析:句意:学校制度规定学生不允许留长发和戴首饰。这里It是形式主语,真正的主语是that引导的从句,主语与require之间是被动关系,故选A。
点评:本题难度适中。在句中作主语的名词性从句称为主语从句, 主语从句所对应的谓语动词通常用第三人称单数的形式。为了整个句子的平衡, 主语从句经常后置, 并用it充当形式主语(此时, that引导的主语从句若不放在句首, 可以省略引导词that)。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。
即学即练:________ whether it will do us harm or good.
A. It remains to be seen                  B. What remains to be seen
C. What remain to be seen                   D. It remains to see
解析:A。句意:它对我们是利是害,还得看看再说。
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