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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?

题目详情
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?
▼优质解答
答案和解析
on作介词,表示在……的时候,一……就