The missing boy was last seen ____ near the river.A,to play B,to be playing C,play D,playing 为什么不选A,这里被动语态应该加to啊?选什么?为什么?

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• The missing boy was last seen ___ near the river.A.playing　 B.to be playing　　C.play　　D.to play为什么选A?see的被动语态不用还原to吗?为什么不用B,
• The missing boy was last seen ____ near the river.A,to play B,to be playing C,play D,playing 为什么不选A,这里被动语态应该加to啊?选什么?为什么?
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