【題目】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】
考查連詞。句意：人類(lèi)必須首先吃、喝、有房子和衣服，然后才能追求政治、科學(xué)、藝術(shù)和宗教。結(jié)合句意可知此處是before引導(dǎo)的時(shí)間狀語(yǔ)從句，故選B。
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