Entering the room,I found mary at the desk and a let

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Entering the room,I found mary ____at the desk and ____a letter.
A.seated; writing B.seating; writing.
答案选A.
问:关于seated的用法有:
be seated; seated oneself.
怎么会出现这么一道题不是以上格式的呢? 是不是应该填sitting; writing 才对呢?但选项没这个.
hjz20 我还是不懂
它答案是:Entering the room,I found mary seated at the desk and writing a letter.
再问:seat是及物动词,为什么后面还要加介词at呢?

I found that Mary is seated at the desk and writing a letter .

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