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    【题目】Silk ______ one of the primary goods traded along the Silk Road by about 100 BC.
    A.had become
    B.was becoming
    C.has become
    D.is becoming

    【答案】A
    【解析】考查动词时态。句意：到公元前100年为止，丝绸已经成为丝绸之路上交易的主要商品之一。时间状语是by+过去时间，谓语用过去完成时。故选A。

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