After ___down my newspaper ,i walked over to window and looked out A putting B having put但是与walked 有先后关系 为什么不选b呢

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After___downmynewspaper,iwalkedovertowindowandlookedoutAputtingBhavingput但是与walked有先后关系为什么不选b呢After_

After ___down my newspaper ,i walked over to window and looked out A putting B having put但是与walked 有先后关系 为什么不选b呢
After ___down my newspaper ,i walked over to window and looked out A putting B having put
但是与walked 有先后关系 为什么不选b呢

After ___down my newspaper ,i walked over to window and looked out A putting B having put但是与walked 有先后关系 为什么不选b呢
After 本身已经把时间的先后关系表达清楚了,此时习惯用一般式就OK 了

这里的先后关系已经有after表述了,所以用putting down。
完成时强调结果,如果要用的话,可以说
having put down my newspaper, I ~

是A
这里考查非谓语动词
主语I与放下报纸是同一个人,因此是主谓关系,所以是现在分词

选B就不能用after了啊,呵呵,就相当于重复了嘛,直接用Having put就可以表示先后顺序了,所以选A 是对的