15．________is required is that all the students should obey the school regulations．（　�。�
A．WhatB．AsC．ItD．Which

分析 要求所有學(xué)生應(yīng)該遵守校規(guī)．

解答 答案：A．根據(jù)is that all the students should obey the school regulations所有學(xué)生應(yīng)該遵守校規(guī)，可知前面是主語從句，主語從句is required 缺主語成分，所以What is required is that…正確，故選A，注意區(qū)別"It is 過去分詞（said/thought/believed/reported/supposed） that…句型"，據(jù)說，據(jù)報(bào)道…；As is required，…句型中as 引導(dǎo)非限制性定語從句．

點(diǎn)評 本題考查主語從句的連接詞，在在充分分析句型基礎(chǔ)上，同時(shí)熟知it is required that 與what is required is that 區(qū)別便不難選出此題答案．

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