________ 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

試題分析:句意:學校制度規(guī)定學生不允許留長發(fā)和戴首飾。這里It是形式主語,真正的主語是that引導的從句,主語與require之間是被動關系,故選A。
點評:本題難度適中。在句中作主語的名詞性從句稱為主語從句, 主語從句所對應的謂語動詞通常用第三人稱單數(shù)的形式。為了整個句子的平衡, 主語從句經(jīng)常后置, 并用it充當形式主語(此時, that引導的主語從句若不放在句首, 可以省略引導詞that)。it作形式主語代替主語從句主要是為了平衡句子結構, 主語從句的連接詞沒有變化。
即學即練:________ 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:它對我們是利是害,還得看看再說。
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