2. 外语
  3. To some extent, the principle of secrecy has been ______

To some extent, the principle of secrecy has been ______

admin2012-09-13  4
问题 To some extent, the principle of secrecy has been ______
选项 A、maintained
B、held
C、observed
D、implemented
答案A
解析 单词maintain：坚持；保持；维持；主张。单词observe：觉察到；注意到；庆祝；评论；遵守(习俗、法律)。单词implement：实现；使生效；执行(命令、协议、方案、判决)。
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