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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