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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 如果没有人做一些快速的修补工作,这所房子将很快倒塌.

解答 答案:A
本句是if引导的条件状语从句;根据在该从句中关于时态对称的原则可知,如果主句使用了一般将来时(will fall down ),从句应使用一般现在时;B.现在完成时;C.现在进行时;D.过去完成时;故选A

点评 本题考查了if引导的条件状语从句的用法.该条件状语从句表示:如果有从句中的动作发生,就会有主句的动作发生.另外,应牢记在if引导的条件状语从句中关于时态对称的原则(从句通常用一般现在时表达将来的意思,而主句要用一般将来时).

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