【題目】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：絲綢在大約公元前100年成為了沿絲綢之路貿(mào)易的主要商品之一。has become現(xiàn)在完成時(shí)；becomes一般現(xiàn)在時(shí)；had become過去完成時(shí)；became是過去式。根據(jù)句意，在公元前一百年以前已經(jīng)….，應(yīng)該用過去完成時(shí)，選C。

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