what___last night if you___to do your washing

what___last night if you___to do your washing

题目
what___last night if you___to do your washing
A.would you do ; hadn't had
B.would you have done ; hadn't had
C.would you do ; didn't have
D.would you have done ; didn't have
选哪个?为什么呢?
答案
考查虚拟语气 与过去事实相反 从句用过去完成时 选B
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