The first thing she usually does ______ arriving home is to open the windows镜子and air the room.
The first thing she usually does ______ arriving home is to open the windows镜子and air the room.
A.by B.with C.in D.on
标准答案选D,为什么?
A.by B.with C.in D.on
标准答案选D,为什么?
英语人气：571 ℃时间：2019-11-04 13:13:32
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on作介词,表示在……的时候,一……就
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