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

試題分析:考察主語從句。That引導主語從句,在句中不充當任何成分。If不能引導主語從句。What要在句中作主語,賓語,表語等成分。句意:這個城市的公立學校是否要向農(nóng)民工的孩子開放已經(jīng)成為討論的焦點。根據(jù)句意說明前面的主語從句表示的是不確定的事情,故使用whether引導。故D正確。
點評:主語從句是在復合句中充當主語的從句,通常放在主句謂語動詞之前或由形式主語it代替,而本身放在句子末尾。解答這類題目,關鍵在于分析清楚句子結構。通過判斷引導詞在從句中所作的成分及意義,來選擇正確的引導詞。連接主語從句的從屬連詞主要有that, if, whether,和疑問詞(what how where when ...)。that引導表示陳述句的主語從句,if和whether,whether...or not引導表示“是否”,引導一般疑問句。連接代詞主要有who,whom,whose,what,whoever,whomever,whosever,whatever,whichever等。連接代詞一般指疑問,但what, whatever除了指疑問外,也可以指陳述。連接副詞主要有when, where, why, how, whenever, wherever, however等.
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