Is Mary ( ) duty today 应该填什么介词?

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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?
• Is Mary ( ) duty today 应该填什么介词?
• Is Mary ( ) duty today 应该填什么介词?
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