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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