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。本題中的同位語從句that a cure for AIDS will be found.解釋名詞no doubt的內(nèi)容。That在句中不充當(dāng)任何成分,只起引導(dǎo)和連接作用。句意:一些研究人員認(rèn)為,毫無疑問艾滋病的治愈方法將會被發(fā)現(xiàn)。故B正確。
點(diǎn)評:正確判斷句子結(jié)構(gòu)是解題的關(guān)鍵。同位語從句屬于名詞性從句,大多由從屬連詞that引導(dǎo),常常跟在fact, news, idea, thought, question, reply, report, remark, hope, belief等名詞后面。同位語從句一般用來解釋或說明這些名詞的具體含義或內(nèi)容,在邏輯上表現(xiàn)為同位關(guān)系。同位語從句與that引導(dǎo)的定語從句:(1)從先行詞看,同位語從句與名詞之間在邏輯上是“主語+be+表語”的同位關(guān)系。該名詞是需要作特殊說明的抽象名詞。例如:They were delighted at the news that their team had won. The news was that their team had won. (2)從引導(dǎo)詞來看,引導(dǎo)詞that在同位語從句中是連詞,只起連接作用,無具體詞義,that不可省略;that在定語從句中是關(guān)系代詞,它在從句中充當(dāng)一定成分——主語或賓語,有具體詞義,作賓語時(shí)還可以省略。(3)同位語從句的簡易判斷方法,同位語從句與其先行詞在邏輯上是“主語+be+表語”的同位關(guān)系。所以,可以在名詞和從句之間加系動詞be,使之構(gòu)成一個(gè)新句子,如果合乎邏輯,句子通順,則原句為同位語從句;定語從句是不能夠用系表結(jié)構(gòu)把先行詞與從句連接起來的。
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