问题补充：
Please make sure that this room is when the visitors arrive.
A. in use
B. in peace
C. in order
D. in place
答案：
A. in use
B. in peace
(答案→)C. in order
D. in place
解析：本题的含义是当游客到达这个房间的时候，请务必使这个房间整齐有条理，in order表示整齐或有条理的意思，故本题选C。
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