If it__________ possible, I would have helped him, but I was too busy.A．is B...

作者: tihaiku 人气: - 评论: 0

问题 If it__________ possible, I would have helped him, but I was too busy.

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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