单选题According to one resident, they are short of sleep because ______.A they are too tired to fall asleepB they are forbidden to sleep at workC they are kept by treating their patientsD they are too worried about oversleeping
题目
单选题
According to one resident, they are short of sleep because ______.
A
they are too tired to fall asleep
B
they are forbidden to sleep at work
C
they are kept by treating their patients
D
they are too worried about oversleeping