It isn't decided yet _______ we will attend the meeting.
A.ifB.whyC.thatD.whether
D

試題分析:考察主語從句。本句的it是形式主語,真正的主語是后面的主語從句whether we will attend the meeting。If不能引導(dǎo)主語從句,that引導(dǎo)主語從句在句中不充當(dāng)任何成分,why與句意不相符。句意:我們是否要參加會(huì)議還沒有被決定。故D正確。
點(diǎn)評(píng):主語從句是在復(fù)合句中充當(dāng)主語的從句,通常放在主句謂語動(dòng)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(guān)鍵在于分析清楚句子結(jié)構(gòu)。通過判斷引導(dǎo)詞在從句中所作的成分及意義,來選擇正確的引導(dǎo)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(dǎo)表示陳述句的主語從句,if和whether,whether...or not引導(dǎo)表示“是否”,引導(dǎo)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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