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

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

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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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