【題目】Silk ______ one of the primary goods traded along the Silk Road by about 100 BC.

A. had become B. reject

C. control D. abandon

【答案】A

【解析】

試題句意：到公元前100年為止，絲綢已經(jīng)成為絲綢之路上交易的主要商品之一。時(shí)間狀語是by+過去時(shí)間，謂語用過去完成時(shí)。故選A。

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