【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
在线课程【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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