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The house could fall down soon if no one ______ some quick repair work.
A.doesB.has doneC.is doingD.had done
A

试题分析:句意:如果没有人迅速的修理这个房子,很快它就会倒了。条件状语从句由if或unless引导,表示如果有从句中的动作发生,就会有主句的动作发生。在条件状语从句中,主句是将来时、祈使句或含有情态动词的句子时,这里could表示不确定的可能,不是过去式,从句要使用一般现在时表达将来的意思(即:主将从现)。故正确答案为C项。
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