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______ it ______ for your help, I couldn’t have made any progress.
A.Had; not beenB.Should; not been
C.Did; not beenD.Not; been
A
考查虚拟语气。根据语境可知考查与过去事实相反的虚拟语气,故从句用had + v-ed,had it not been =" if" it had not been,故选A。
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