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

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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. wasbecoming

C.has become D. isbecoming

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【答案】A

【解析】试题分析：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。