i saw her ____into the library when i was walking past

I saw her (B.coming) into the library when I was walking past.
当我经过图书馆时,我看见她正在进去.
see sb do,看见某人做了某事.see sb doing,看见某人正在做.
根据when时间状语,这里还是应该强调动作正在进行更好.

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