Question

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

A. has becomeB. becomesC. had becomeD. became

Answer 1

【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。