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    【题目】Humans must first of all eat, drink, have houses and clothing, _____ they can pursue politics, science, art and religion.

    A. if B. before

    C. whether D. how

    【答案】B

    【解析】

    考查连词。句意：人类必须首先吃、喝、有房子和衣服，然后才能追求政治、科学、艺术和宗教。结合句意可知此处是before引导的时间状语从句，故选B。

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