If they(  )more aware of the trends, the

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问题 If they(  )more aware of the trends, they could have avoided bankruptcy.A.wereB.areC.have beenD.had been

选项 A.were
B.are
C.have been
D.had been

答案 D

解析 句子的主句为“could have+ P.P.”结构,表示对过去事实的假设,从句应为“had+ P.P.”结构,因此答案为D项。
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