Silk one of the primary goods traded along the Silk Road by about 100 BC.A. had become B. rejectC. c

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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. reject

C. control D. abandon

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【答案】A

【解析】

试题句意：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。