2. 外语
  3. A land free from destruction, plus wealth, natural resources, and labor supply—all these were important(1)_____ in helping Engla

A land free from destruction, plus wealth, natural resources, and labor supply—all these were important(1)_____ in helping Engla

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问题     A land free from destruction, plus wealth, natural resources, and labor supply—all these were important(1)_____ in helping England to become the center for the Industrial Revolution.(2)_____ they were not enough. Something(3)_____ was needed to start the industrial process. That "something special" was men—(4)_____ individuals who could invent machines, find new(5)_____ of power, and establish business organizations to reshape society.
    The men who(6)_____ the machines of the Industrial Revolution(7)_____ from many backgrounds and many occupations. Many of them were (8)_____ inventors than scientists. A man who is a (9)_____ scientist is primarily interested in doing his research(10)_____. He is not necessarily working(11)_____ that his findings can be used.
    An inventor or one interested in applied science is(12)_____ trying to make something that has a concrete(13)_____. He may try to solve a problem by using the theories(14)_____ science or by experimenting through trial and error. Regardless of his method, he is working to obtain a(15)_____ result: the construction of a harvesting machine, the burning of a light bulb, or one of(16)_____ other objectives.
    Most of the people who(17)_____ the machines of the Industrial Revolution were inventors, not trained scientists. A few were both scientists and inventors. Even those who had(18)_____ or no training in science might not have made their inventions(19)_____ a groundwork had not been laid by scientists years(20)_____.
(20)
选项 A、ago
B、past
C、ahead
D、before
答案D
解析 had not been laid用了过去完成时，即表示过去某个时间以前发生的动作，因而只能用before。ago只与一般过去时连用，故排除A。
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