When the students finish _______ their homework,they went on ______outside.A.doing,playing
问题描述：
When the students finish _______ their homework,they went on ______outside.A.doing,playing
B.to do,to play C.doing,to play D.to do,playing
答
C
finish doing sth 结束做某事
go on doing 继续做同一件事
go on to do继续做另外一件事
根据句意 当孩子们做完家庭作业后,紧接着就出去玩了（是俩件事,因此第二个空用to do）