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

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

when i came back,i saw Tom()adiaryA.writingB.was writing选哪个,为什么?快
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?快
答案:A
翻译:我回来的时候,看见汤姆正在写日记.
see sb.doing sth.看见某人正做某事.