题目内容


．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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