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  3. Cotton, like silk, was discovered and made【61】cloth by man before the historical period【62】. Its first recorded use was in India

Cotton, like silk, was discovered and made【61】cloth by man before the historical period【62】. Its first recorded use was in India

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问题     Cotton, like silk, was discovered and made【61】cloth by man before the historical period【62】. Its first recorded use was in India【63】cotton cloth of very fine texture, almost【64】 silk, was made. When the Spanish【65】in the New World, they found that the Incas, the Mayas, and the Aztecs knew【66】cotton cloth.【67】of the cotton cloth made in Peru, even before the days of the Incas,【68】that it is kept in museums.
    Cotton is the most important of【69】textiles.  Even now, with many artificial materials【70】,more than half of all textile products are made of cotton.
    Cotton comes【71】a plant of that name. When the plant is mature, the cotton grows in a white ball around the seed. To【72】the cotton for market, the seed【73】from the cotton fiber. This【74】by a machine called the cotton gin. Then cotton is【75】into huge bundles called bales,【76】are sent to the mills.【77】the fibers are combed【78】they will all be turned in the same direction.【79】, the fibers are spun into thread. From the thread, the cotton is woven into【80】.
选项 A、begins
B、has begun
C、began
D、was begun
答案C
解析 本题测试时态。before 引导的时间状语从句意为“在人类有历史记录之前”，用过去时即可。
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