【題目】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】考查動詞時態(tài)。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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