Question

【题目】We have been t（做生意）with their company in silk these years.

Answer 1

【答案】trading
【解析】trading 考查固定用法。have been doing 是现在完成进行时,表过去发生的动作一直在进行到现在。句意：这些年来我们一直在和他们的公司在一起进行贸易。故填trading。