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_____ the city’s public school system should be open to the children of migrant workers has become the focus of discussion.
A.That B.What C.Whether D.If
C

试题分析:考查主语从句。本句中的Whether the city’s public school system should be open to the children of migrant workers是一个主语从句,因为主语从句中的句子结构很完整,使用不能使用what,因为what在句中要做主语,宾语,表语等。If不能引导主语从句,that表示的是确定的事情。句意:公立学校是否要对移民的工人开放这个问题已经成为了讨论的焦点。故C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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