______ rockets had been used sporadically for several hundred years they remained a relat
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______ rockets had been used sporadically for several hundred years, they remained a relatively minor artifact of civilization until the twentieth century.
A．Despite
B．In spite of
C．In spite the fact that
D．Despite the fact that
请帮忙给出正确答案和分析，谢谢！
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正确答案：D
状语从句题。despite和inspiteof为介词，后接宾语表示“尽管”之意，如后接的是让步状语从句，则要用despitethefactthat或inspiteofthefactthat，其用法相当于though。本空后为一从句，故用despitethefactthat。