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【题目】The development of industry has been_______ gradual process throughout _______ human existence, from stone tools to modern technology.
A.不填, the
B.the; a
C.a; 不填
D.a; a

【答案】C
【解析】句意:工业的发展在人类存在的历史,是从石器工具到现代技术的一个渐进过程。第一空process是可数名词,第一次出现一般用不定冠词,且此次表示“一个”的概念;第二空existence是不可数名词,其此处表示抽象概念,故用零冠词。选C。

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