The orders will come into ______ on the l5th.

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问题 The orders will come into ______ on the l5th.

选项 A、action
B、operation
C、use
D、existence

答案B

解析 operation n.运转.运行(come/go into operation施行,实行,生效;bring/put into operation实施,使生效,使;运行)。come/go into action开始战斗,开始行动。come into use(以事物作主语)开始(被)使用。come into existence(以事物作主语)开始存在。
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