．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條件狀語從句的虛擬語氣。If I _________too late last night是含有if條件狀語從句的虛擬語氣，根據(jù)last night可知是指的過去的事實，要用had done的過去完成時態(tài)，所以選B。
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