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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:1422

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
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Thedevelopmentofindustryhasbee