isrequiredisthatallthestudentsshouldobeytheschoolregulations．（）A.WhatB.AsC.ItD.Which

Question

________is required is that all the students should obey the school regulations．（　　）

A. What

B. As

C. It

D. Which

Answer 1

答案：A．根据is that all the students should obey the school regulations所有学生应该遵守校规，可知前面是主语从句，主语从句is required 缺主语成分，所以What is required is that…正确，故选A，注意区别"It is 过去分词（said/thought/believed/reported/supposed） that…句型"，据说，据报道…；As is required，…句型中as 引导非限制性定语从句．