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

試題分析:句意:如果沒有人迅速的修理這個房子,很快它就會倒了。條件狀語從句由if或unless引導(dǎo),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。在條件狀語從句中,主句是將來時、祈使句或含有情態(tài)動詞的句子時,這里could表示不確定的可能,不是過去式,從句要使用一般現(xiàn)在時表達(dá)將來的意思(即:主將從現(xiàn))。故正確答案為C項(xiàng)。
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