【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)的時間狀語從句，故選B。

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