问题
选择题
.It is the third time that our water supply _______during the day.
A．was cut out
B．has been cut off
C．has been call off
D．was cut down
答案
答案：B
题目分析：句意：这是这一天第三次我们的水被切断。It is the third time that从句中用现在完成时，排除AD，cut off“切断”，call off “取消”，选B。