12.If the rules of perspective had not been discovered,no one _______ able to paint such realistic pictures.( 。
A.would have beenB.should have been
C.must have beenD.could have been

分析 如果沒有發(fā)現(xiàn)透視法則,誰也不能畫出如此真實(shí)的花.

解答 答案是A.本題考虛擬條件句.與過去事實(shí)相反的虛擬條件句中往往用過去完成時(shí),主句中用"would/should/could/might+have done";由從句中的過去完成時(shí)had not been found 判斷這是與過去事實(shí)相反的虛擬條件,排除C項(xiàng);could表示"能夠",不與be able to 連用,所以排除D;情態(tài)動(dòng)詞would表示"會(huì)",should表示"應(yīng)該";根據(jù)句意是"不會(huì)能夠",所以判斷答案是B.

點(diǎn)評(píng) 在掌握虛擬語氣的規(guī)則的基礎(chǔ)上,判斷題干屬于什么類型的虛擬,然后根據(jù)語境,選用恰當(dāng)?shù)膭?dòng)詞形式表達(dá)虛擬.

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