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

C  第一空 process 是可數(shù)名詞，第一次出現(xiàn)一般用不定冠詞a，第二個(gè)空human existence（人類存在） 是抽象名詞，是泛指不是特指所以不用加冠詞。

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