In order to avoid something unpleasant, everyone present should stick to the agreement. A.

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A. traditionally
B. accidentally
(答案→)C. consciously
D. personally
解析：考查副词辨析。句意“为了避免不愉快的事情，每个出席的人应该自觉地遵守协议内容。”A“传统地”；B“意外地，偶然地”；C“有意识地，自觉地”；D“个人地，私下地”。故选C。