____ the PX project will be called off depends, for it still needs more research and discussion. 
A.That B.WhetherC.WhereD.What
B

試題分析: 考察主語從句。句義:PX工程是否要會(huì)取消還要看情況而定,因?yàn)樗需要更多的研究和討論。前面的主語從句the PX project will be called off是一個(gè)被動(dòng)語態(tài)的形式,句子結(jié)構(gòu)是很完整的。不能使用what,因?yàn)閣hat在句中要充當(dāng)句子成分的。Where的語義不配。That與上下文的意思不配。故B正確。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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