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.If I _________too late last night, I could not have fallen asleep in class.
A.didn’t stay upB.hadn’t stayed up
C.don’t stay upD.haven’t stayed up
B
考查if条件状语从句的虚拟语气。If I _________too late last night是含有if条件状语从句的虚拟语气,根据last night可知是指的过去的事实,要用had done的过去完成时态,所以选B。
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