—What’s wrong with you, Eric? You look tired.—I to prepare for the final exam last night.

—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

A. picked upB. woke up(答案→)C. stayed upD. put up解析：句意：---你怎么了Eric？你看上去很累。---我昨天晚上熬夜准备期末考试。A. picked up捡起，收拾，不费力的学会，获得；B. woke up 醒来，叫醒； C. stayed up熬夜，不睡觉； D. put up举起，张贴，建造，推举，提名。根据句意故选C。

回答的不错