问题
选择题
______ 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
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。