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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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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