If it__________ possible, I would have h

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问题 If it__________ possible, I would have helped him, but I was too busy.A．isB．wasC．wereD．had been

选项 A．is
B．was
C．were
D．had been

答案 D

解析考查虚拟语气。根据“but I was too busy”可以判断，该句表达的是与过去事实相反的情况，是非真实条件句，所以用虚拟语气。主句谓语用would／should／could／might have+过去分词．从句谓语用had+过去分词。故选D。

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