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

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

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

A.has done

B.is doing

C.does

D.had done

试题答案

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。