中文谷Silk
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問題詳情：
Silk_________ one of the primary goods traded along the Silk Road by about 100 BC.
A. had become B. wasbecoming become D. isbecoming
【回答】
A
考點：考查動詞時態。
知識點：動詞時態與語態
題型：選擇題
標籤：
silk
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