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【题目】Silk _____ one of the main goods traded along the Silk Road by about 100 BC.

A. has becomeB. becomesC. had becomeD. became

【答案】C

【解析】

句意:丝绸在大约公元前100年成为了沿丝绸之路贸易的主要商品之一。has become现在完成时;becomes一般现在时;had become过去完成时;became是过去式。根据句意,在公元前一百年以前已经….,应该用过去完成时,选C

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