when i came back,i saw Tom()adiaryA.writingB.was writing选哪个,为什么?

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whenicameback,isawTom()adiaryA.writingB.waswriting选哪个,为什么?whenicameback,isawTom()adiaryA.writingB.wa

when i came back,i saw Tom()adiaryA.writingB.was writing选哪个,为什么?
when i came back,i saw Tom()adiary
A.writing
B.was writing
选哪个,为什么?

when i came back,i saw Tom()adiaryA.writingB.was writing选哪个,为什么?
A
B俩动词了,只能一套主谓宾,这又不是从句,see sb doing 就是固定用法
或者我刚才说的see sb do

A.writing
see sb. doing sth. 看见某人正在做某事
see sb. do sth. 看见某人做某事,表示经常性之类的

a