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

試題分析:考查同位語從句。本題中的whether引導同位語從句,對名詞idea的內容進行解釋。句意:我不知道他們是否會通過期末考試。根據(jù)句意說明D項正確。That在同位語從句中沒有任何的意思,BC兩項與句意不符。
點評:解答這類題目,關鍵在于分析清楚句子結構,知道引導詞的使用習慣。通過判斷引導詞在從句中所作的成分,來選擇正確的引導詞。連接同位語從句的從屬連詞主要有that, if, whether,和疑問詞(what how where when ...)。that引導表示陳述句的同位語從句,if和whether,whether...or not引導表示“是否”的一般疑問句的同位語從句。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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