The eighteenth and nineteenth centuries _____ the widespread use of electricity and the birth of the steam engine , leading to the development of factories and cities.
| A．watched | B．observed | C．saw | D．showed |
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The eighteenth and nineteenth centuries _____ the widespread use of electricity and the birth of the steam engine , leading to the development of factories and cities.
| A．watched | B．observed | C．saw | D．showed |
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