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Before ______ white,the door should be cleaned thoroughly.A.

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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.
Before ______ white,the door should be cleaned thoroughly.A. Before being painted pink ,the wall should be cleaned throug We should k____at the door before entering. The room is still in a mess;it ___ thoroughly cleaned. A lady i______ white opens the door we should never wait for the door to open before ______ at the door before you enter my room, please. A．Knock Who cleaned the classroom is a question( )we should answer 问We should make the school ()?a.cleaned,b.cleaning i remembered ______ the door before i left the house ______ at the door before you enter my room,please. The house with a white door is m______.