Question

Nick stayed up really late last night. So this morning he        by the time the class began.
A. had fallen asleep            B. had showm up              C. had realized

Answer 1

A

解析试题分析： stay up熬夜，by the time直到，句意：Nick昨晚熬夜到很晚，因此今天上午直到上课他也没有起来。fall asleep入睡，睡觉。began是过去时，过去的过去用过去完成时，故选A。
考点：考查过去完成时的用法。