He was often seen____basketball on the playgroundA play Bis played Cto play Dplaying

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He was often seen____basketball on the playgroundA play Bis played Cto play Dplaying
He was often seen____basketball on the playground
A play Bis played Cto play Dplaying

He was often seen____basketball on the playgroundA play Bis played Cto play Dplaying
D,playing,see sb doing的被动式,People often saw him playing basketball on the playground

playing
see sb do 看见全过程
see sb doing 只是看见,没有全过程。