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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