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

分析 如果沒有人做一些快速的修補工作，這所房子將很快倒塌．

解答 答案：A
本句是if引導的條件狀語從句；根據在該從句中關于時態(tài)對稱的原則可知，如果主句使用了一般將來時（will fall down ），從句應使用一般現在時；B．現在完成時；C．現在進行時；D．過去完成時；故選A

點評 本題考查了if引導的條件狀語從句的用法．該條件狀語從句表示：如果有從句中的動作發(fā)生，就會有主句的動作發(fā)生．另外，應牢記在if引導的條件狀語從句中關于時態(tài)對稱的原則（從句通常用一般現在時表達將來的意思，而主句要用一般將來時）．

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