Silk_oneoftheprimarygoodstradedalongtheS...[高三][地理]
收录时间：2021-08-30 答题：高三地理（俞老师）
【题目】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】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。
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