3．— They sat still in the room, ________.
— Why did they do like that?
A．drawing the curtains
B．with the curtains drawn
C．with the curtains drawing
D．having the curtains drawn
解析：根据语境可知“他拉下窗帘静静地坐在房间里”，draw“拉”这一动作已完成又是curtain所承受的动作，故用B。
答案：B
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