______ 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
考查虛擬語氣。根據(jù)語境可知考查與過去事實(shí)相反的虛擬語氣，故從句用had + v-ed，had it not been =" if" it had not been，故選A。
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