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

发布时间：2020-08-16 19:04:19

The house could fall down soon if no one       some quick repair work.
A. has done
B. is doing
C. does
D. had done

网友回答

A. has done
B. is doing
(答案→)C. does
D. had done
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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