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  3. The history of African—Americans during the past 400 years is traditionally narrated【1】an ongoing struggle against【2】and indiffe

The history of African—Americans during the past 400 years is traditionally narrated【1】an ongoing struggle against【2】and indiffe

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问题     The history of African—Americans during the past 400 years is traditionally narrated【1】an ongoing struggle against【2】and indifference on the part of the American  mainstream, and a struggle【3】as an upward movement is【4】toward ever more justice and opportunity.
    Technology in and of【5】is not at fault; it’s much too simple to say that gunpowder  or agricultural machinery or fiber optics【6】been the enemy of an【7】group of people. A certain machine is put【8】work in a certain way—the purpose【9】which it was designed. The people who design the machines are not intent on unleashing chaos; they are usually trying to【10】a task more quickly, cleanly, or cheaply,【11】the imperative of innovation and efficiency that has ruled Western civilization【12】the Renaissance.
    Mastery of technology is second only【13】money as the true measure of accomplishment  in this country, and it is very likely that by【14】this under-representation in the technological realm, and by not questioning and examining the folkways that have【15】it, blacks are allowing.【16】to be kept out of the mainstream once again. This time, however, they will be【17】from the greatest cash engine of the twenty-first century. Inner-city blacks in particular are in danger, and the beautiful suburbs【18】ring the decay of Hartford, shed the past and learn to exist without contemplating or encountering the tragedy of the inner city.
    And blacks must change as well. The ways that【19】their ancestors through captivity and coming to freedom have begun to loose their utility. If blacks【20】to survive as full participants in this society, they have to understand what works now.
选项 A、have
B、to have
C、has
D、to has
答案C
解析 根据就近原则，谓语动词应与主语“fiber optics”保持一致，所以选用单数形式“has”。
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