you should always remember to knock the door when _____ the room.该填什么?

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youshouldalwaysremembertoknockthedoorwhen_____theroom.该填什么?youshouldalwaysremembertoknockthedoorwhen

you should always remember to knock the door when _____ the room.该填什么?
you should always remember to knock the door when _____ the room.
该填什么?

you should always remember to knock the door when _____ the room.该填什么?
You should always remember to knock the door when (entering)the room.
进入房间时,你应该总是记得敲门.