摘要： 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
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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