找出和括号内词组意思相同或相近的选项
问题描述：
找出和括号内词组意思相同或相近的选项
During those days of SARS ,doctors and nurses had to be on duty (round the clock).
A.day after day
B.for one day
C.day by day
D.day and night
答
应该是D 夜以继日
A 一天又一天
B 做了一天
C 一天天地