问题
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(The metal) aluminum (has been) (first) isolated (early) in the nineteenth century.A.The m
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Baroque has been the term used by art historians for almost a century to the dominant styl
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Acupuncture has been practiced in China for more than 2 000 years, but its using Western w
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The London Stock Exchange has been famous as a place for men only, and women used to be st
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The machine needs a complete ______ since it has been in use for over ten years.A.maintain
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The most common use of telecommunication satellites has been for _____ telephone ca