When the meeting was , it was already midnight.A. at the endB. end upC. at an endD. in the

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A. at the end
B. end up
(答案→)C. at an end
D. in the end
解析：短语辨析。A在…结束的时候，在…末端；B以…结束；C结束；D最后终于。句意：当会议结束的时候，已经是半夜了。根据句意说明C正确。