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I have no idea _______ they will pass the final exam.
A.that B.when C.whyD.whether
D

试题分析:考查同位语从句。本题中的whether引导同位语从句,对名词idea的内容进行解释。句意:我不知道他们是否会通过期末考试。根据句意说明D项正确。That在同位语从句中没有任何的意思,BC两项与句意不符。
点评:解答这类题目,关键在于分析清楚句子结构,知道引导词的使用习惯。通过判断引导词在从句中所作的成分,来选择正确的引导词。连接同位语从句的从属连词主要有that, if, whether,和疑问词(what how where when ...)。that引导表示陈述句的同位语从句,if和whether,whether...or not引导表示“是否”的一般疑问句的同位语从句。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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