( ).--I saw Betty go to Grandpa Li's home just now.

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( ).--I saw Betty go to Grandpa Li's home just now.
　　--Yes.She’s often seen _________ the old man with the housework..
　　A:help B.to help C.helps D.helped
答案选择B.这道题的意思我都没弄懂,更不会选择了.
它是一个固定搭配吗?还是什么其他的,麻烦讲清楚一点.

译：我刚刚看见Betty去了李爷爷家.是的,她经常被看见帮老人做家务.这是一个被动句式,谓语动词是’s seen,因为已经有谓语动词了,后面就不能再接动词,及动词的各种时态,只能接不定式了,所以选B,明白了吗,
再问：那它是不是一个固定搭配？

( ).--I saw Betty go to Grandpa Li's home just now. - i saw betty go to Grandpa Zhang's home just now - yes ,she I ----(see) Li Lei -----(go) out just now.答案是saw,go,为什么不是 sa I saw Mr Li __（go) into the school library just now I saw Li Lei (go) out just now.这里的空格填什么?为什么? I saw him go out just now. I saw my teacher go in to the classroom just now.改成被动语态怎么改? I saw my mother ___upstairs just now.A go B went C does D to I saw him go out just now.同义句转换 I will go to grandpa's farm.中文的意思 It's 6:30 p.m.It's time to go home.I must l__ now 26.Mary _______ be at home.I saw her in the library just now