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thecity’spublicschoolsystemshouldbeopentothechildrenofmigrantworkershas become the focus of discussion.
A.ThatB.IfC.WhatD.Whether
D

试题分析:考察主语从句。That引导主语从句,在句中不充当任何成分。If不能引导主语从句。What要在句中作主语,宾语,表语等成分。句意:这个城市的公立学校是否要向农民工的孩子开放已经成为讨论的焦点。根据句意说明前面的主语从句表示的是不确定的事情,故使用whether引导。故D正确。
点评:主语从句是在复合句中充当主语的从句,通常放在主句谓语动词之前或由形式主语it代替,而本身放在句子末尾。解答这类题目,关键在于分析清楚句子结构。通过判断引导词在从句中所作的成分及意义,来选择正确的引导词。连接主语从句的从属连词主要有that, if, whether,和疑问词(what how where when ...)。that引导表示陈述句的主语从句,if和whether,whether...or not引导表示“是否”,引导一般疑问句。连接代词主要有who,whom,whose,what,whoever,whomever,whosever,whatever,whichever等。连接代词一般指疑问,但what, whatever除了指疑问外,也可以指陈述。连接副词主要有when, where, why, how, whenever, wherever, however等.
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