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
A. 不填; the
B. the; a
C. a; 不填
D. a; a
【答案】
A. 不填; the
B. the; a
C. a; 不填
D. a; a
A. 不填; the
B. the; a
C. a; 不填
D. a; a
【答案】
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