The boy was seen _ the piano at 9 yesterday.A.to play B.play C.playing D.palyed我认为答案是A,被动语态要加to 为什么答案是C呢?

英语翻译The boy was _ _ _ __ _ the street when the UFO _ _ _ _ __ _. The boy was last seen being playing by the riverside with other boys 改错 The boy was seen ______on the sports ground.play / to play /playing 这个男孩三岁时就能讲英语了.The boy was _ _speak English when he was at the _ _ three The boy was seen _ the piano at 9 yesterday.A.to play B.play C.playing D.palyed我认为答案是A,被动语态要加to 为什么答案是C呢? i saw a boy.the boy was playing with a cat.i saw a boy _ _ _ _ a cat合并为一句 1.The missing boy was last seen ____ near the river.A.playing B.to be playing C.play D.to pl1.The missing boy was last seen __A__ near the river.A.playing B.to be playing C.play D.to play不是“被看见”吗?为什么不选B?8.You can’t have th The boy was seen to run by me yesterday为什么加to The boy was seen ___(hand in)his toy this morning. 单项填空. Yesterday _ 8-year-old fell into the river. _ boy was 刚才看见老师进了教室 英语 怎么说the teacher was seen _ _ into the classroom just now. Seen this ,the litte boy couldn't help ___________(笑） I haven't seen the boy since 1999 改为一般疑问句 ____ _____ _____the boy since 1999 _____the terrible accident ,the little boy didn't dare go out along any moreA having seen B to see C seen D being seen 1 Will you please repeat your idea?Certainly.But I think it certain that you _ your attention.A don't pay B hadn't pay C weren't paying D aren't paying 2 It was in the stone house _ was built as a school by local villagers _ the boy finished his prim 1 Will you please repeat your idea?Certainly.But I think it certain that you _ your attention.A don't payB hadn't payC weren't paying D aren't paying2 It was in the stone house _ was built as a school by local villagers _ the boy finished his primary So frightened ( )that he couldn't say a wordA.the boy was B.was the boy C.did the boy be D.be the boy The boy was seen ___on the playground.A.play B.to play C.played D.to playing.