成人学士学位英语

单选题The development of industry has been _____ gradual process throughout _____ human existence, from stone tools to modern technology.A 不填; theB the; aC a; 不填D a; a

题目
单选题
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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