问题标题:
ChildrencelebrateHalloweenby____(play)thegame"trickortreat"快
问题描述:

ChildrencelebrateHalloweenby____(play)thegame"trickortreat"

刘检华回答:
  playingby是介词因此后面的动词得是动名词所以加ing
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