8．The house will fall down soon if no one _______ some quick repair work．（　　）
A．doesB．has doneC．is doingD．had done

分析 如果沒(méi)有人做一些快速的修補(bǔ)工作，這所房子將很快倒塌．

解答 答案：A
本句是if引導(dǎo)的條件狀語(yǔ)從句；根據(jù)在該從句中關(guān)于時(shí)態(tài)對(duì)稱(chēng)的原則可知，如果主句使用了一般將來(lái)時(shí)（will fall down ），從句應(yīng)使用一般現(xiàn)在時(shí)；B．現(xiàn)在完成時(shí)；C．現(xiàn)在進(jìn)行時(shí)；D．過(guò)去完成時(shí)；故選A

點(diǎn)評(píng) 本題考查了if引導(dǎo)的條件狀語(yǔ)從句的用法．該條件狀語(yǔ)從句表示：如果有從句中的動(dòng)作發(fā)生，就會(huì)有主句的動(dòng)作發(fā)生．另外，應(yīng)牢記在if引導(dǎo)的條件狀語(yǔ)從句中關(guān)于時(shí)態(tài)對(duì)稱(chēng)的原則（從句通常用一般現(xiàn)在時(shí)表達(dá)將來(lái)的意思，而主句要用一般將來(lái)時(shí)）．

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