【題目】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

【答案】A

【解析】試題分析：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。時間狀語是by+過去時間，謂語用過去完成時。故選A。

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