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?

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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?
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?

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?
on作介词,表示在……的时候,一……就

... ... 是体育老师说的选D么... ...
应该选E. when

非要选的话,勉强选A吧,我是美籍华人,无论选ABCD哪一个,老外都看不懂的。

on作介词,表示在……的时候,一……就