Before ______ white,the door should be cleaned thoroughly.A.painted B.being painted 选哪个?why

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Before______white,thedoorshouldbecleanedthoroughly.A.paintedB.beingpainted选哪个?whyBefore______white,t

Before ______ white,the door should be cleaned thoroughly.A.painted B.being painted 选哪个?why
Before ______ white,the door should be cleaned thoroughly.A.painted B.being painted 选哪个?why

Before ______ white,the door should be cleaned thoroughly.A.painted B.being painted 选哪个?why
A.before 引导的应该是时间状语从句,完整的句子应该是Before it is painted white,the door should be cleaned thoroughly.因为从句和主句的主语指的是同一事物,就是the door,而从句的动词又是be动词,所以省略从句的主语和be动词,就是省略it is,最后就剩下Before painted white,the door should be cleaned thoroughly.因此选A.

A. 这是考查非谓语动词的题,before引导时间状语从句,paint 的逻辑主语和主句的主语一致,the door与paint是被动关系,所以用过去分词。