if he -------- hard in thehe past five years,things wouldn't

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if he -------- hard in thehe past five years,things wouldn't be going be going so smoothly.
a.had not been working b.was not working c.has not been working d.were not working
为什么选a 不选d

这句主要考查的是虚拟语气的用法.
前句是与过去事实相反的虚拟语气,后句是与现在事实相反的虚拟语气.
所以正确答案是A.
因为与过去事实相反时,从句的动词要用had+done的形式.

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