The United Nations Conference on Drug Abuse, which was held earlier this year in

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问题 The United Nations Conference on Drug Abuse, which was held earlier this year in Vienna, was a very______meeting.

选项 A、productive
B、protective
C、obligatory
D、compulsory

答案 A

解析 productive"有成效的，有结果的"；protective"保护的"；obligatory"有义务的"；compulsory"强制性的"。

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