It was a meeting importance I did not realize at that time.A. thatB. whichC. itsD. whose

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A. that
B. which
C. its
(答案→)D. whose
解析：考查定语从句：先行词是a meeting，定语从句中缺少定语，用whose修饰importance，句意：这是一个那时我还没有意识到重要性的会议。选D。