单选题
21.
It looks like we'll have to walk down to the first floor as the elevators are temporarily ______.
A、
out of work
B、
out of source
C、
out of service
D、
out of the blue
【正确答案】
C
【答案解析】
选项A、B和D放在句子中均不合逻辑。选项C正确，out of service意思是“停止运行，故障”。
提交答案
关闭