it for your help I couldn’t have made any progress.A. Had; not beenB. Should; not beenC

问题补充：

it for your help, I couldn’t have made any progress.

A. Had; not been

B. Should; not been

C. Did; not been

D. Not; been

答案：

(答案→)A. Had; not been

B. Should; not been

C. Did; not been

D. Not; been

解析：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。