Some researchers believe that there is no doubt ____ a cure for AIDS will be found.
A.whichB.thatC.whatD.whether
B

試題分析:考查同位語從句:句意:一些研究人員相信艾滋病的療法肯定會被發(fā)現(xiàn)的。Doubt是同位詞,因為是否定句,所以用that連接的是同位語從句,對doubt的內(nèi)容進行說明,that不做成分,只起到連接的作用,如果是肯定句,就是用whether連接同位語從句。選B。
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。
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