You may use the room as you like, you clean it up afterwards.
A. as though
B. so long as
C. now that
D. as far as
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(答案→)A. as though
B. so long as
C. now that
D. as far as
解析：考查固定词组，A. as though好像；B. so long as只要；C. now that既然；D. as far as只要，句子意思“你可以随便使用这个房间，用完后你要打扫干净”