题目内容

17．I have no idea________ they will pass the final exam．（　　）
A．thatB．whenC．whetherD．why

分析 我不知道他们是否会通过期末考试．

解答 答案C．
分析句子结构可知，"________ they will pass the final exam"为同位语从句，对名词"idea"的内容进行解释说明．"that"在同位语从句中没有任何的意思，故排除；BC两项与句意不符，故排除；根据"I have no idea"可知，我不知道他们能否通过期末考试，因此应该用连接词"whether   是否"来引导同位语从句，同位语从句中不能用"if"来引导，故选C．

点评 本题考查同位语从句．同位语从句是意义完整地陈述句时，用连词that引导，that在从句中不充当任何成分，只起连接词作用，通常不省略；引导定语从句的that在句中充当一定的成分，并且作宾语时可以省略．

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