The house could fall down soon if no one       some quick repair work.A.has done

The house could fall down soon if no one       some quick repair work.A.has done

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The house could fall down soon if no one       some quick repair work.
A.has doneB.is doingC.doesD.had done

答案
C
解析
考查时态。在if引导的条件状语从句中,当主句中含有情态动词时,从句用一般现在时。注意此处主句中的could表示不太肯定的语气,不是一般过去时的标志。
举一反三
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A.wearB.wearsC.has wornD.have worn

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Great as Newton was, many of his ideas _______ today and are being modified by the work of scientists of our time.
A.are to challenge B.may be challenged
C.have been challenged D.are challenging

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A.has live; a such great heightB.have live; such a great height
C.has lived; a such great heightD.have lived; such a great height

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