Question

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

A.is
B.was
C.were
D.had been

Answer 1

【答案】：D

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桥亮锋相反的情况，是非真实条件句，所以用虚拟语气。主敏晌句谓语用would／should／could／might have+过去分词．从句谓语用had+过去键宽分词。故选D。