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

分析 我不知道他們是否會通過期末考試．

解答 答案C．
分析句子結(jié)構(gòu)可知，"________ they will pass the final exam"為同位語從句，對名詞"idea"的內(nèi)容進(jìn)行解釋說明．"that"在同位語從句中沒有任何的意思，故排除；BC兩項與句意不符，故排除；根據(jù)"I have no idea"可知，我不知道他們能否通過期末考試，因此應(yīng)該用連接詞"whether   是否"來引導(dǎo)同位語從句，同位語從句中不能用"if"來引導(dǎo)，故選C．

點評 本題考查同位語從句．同位語從句是意義完整地陳述句時，用連詞that引導(dǎo)，that在從句中不充當(dāng)任何成分，只起連接詞作用，通常不省略；引導(dǎo)定語從句的that在句中充當(dāng)一定的成分，并且作賓語時可以省略．

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