Thehousecouldfalldownsoonifnoonesomequickrepairwork.
A.has doneB.is doingC.doesD.had done在线课程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。
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