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    【题目】Some scientists believe that it won’t be long ________ artificial intelligence completely takes the place of human beings.

    A.beforeB.afterC.sinceD.when

    【答案】A

    【解析】

    句意：一些科学家认为用不了多久人工智能就能完全取代人类。

    考查连词的用法。before在…之前；after在…之后；since自从…以来；when当…时候。根据Itis/wasnot(won'tbe)longbefore…“不久就……”是英语中的常用句型，故选A。

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