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 |
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