题目：
---What’s wrong with you, Eric? You look tired.
---I ________ to prepare for the final exam last night.
A．picked up
B．woke up
C．stayed up
D．put up
答案：
答案：C
picked up 捡起，顺便接某人；woke up醒来；stayed up熬夜，不睡觉；put up提供，建造，举起。句意：艾瑞克，你怎么了？你看来很累。——昨晚我熬夜准备期末考试了。结合语境可知选C。
【考点】短语辨析
