In order to finish the research, the pro
问题:
In order to finish the research, the professor always ______, for every day the light in his room didn't go
out until 4 a.m. [ ]
A. mixed up
B. cleaned up
C. turned up
D. stayed up
In order to finish the research, the professor always ______, for every day the light in his room didn't go
out until 4 a.m. [ ]
A. mixed up
B. cleaned up
C. turned up
D. stayed up