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Peter's mission was to examine cars when they crossed the
frontier
frontier
（front） to make sure that they were not smuggling（走私） anything into the country．

【答案】frontier

【解答】

【點評】

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發布：2025/1/1 5:0:1組卷：2引用：2難度：0.7

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Peter's mission was to examine cars when they crossed thefrontierfrontier（front） to make sure that they were not smuggling（走私） anything into the country．