i went to see tom at the hotel. i did n't meet him because i didn't know_which room he stayed in和where he stayed in选哪个 为什么

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i went to see tom at the hotel. i did n't meet him because i didn't know_
which room he stayed in和where he stayed in
选哪个 为什么

选which room he stayed in
因为后面有个介词in ,如 in the room
where 一般不与介词搭配的