The development of industry has been _____ gradual process throughout _____ human existence, from stone tools to modern technology.
A./; the |
B.the; a |
C.a; / |
D.a; a |
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The development of industry has been _____ gradual process throughout _____ human existence, from stone tools to modern technology.
A./; the |
B.the; a |
C.a; / |
D.a; a |