当家里漏电保护器突然跳闸后，应该如何做（）？
A.立即合闸
B.查明原因、排除故障
C.更换漏电保护器
D.等待来电
参考答案：B
It’s time that I my hair cut. It’s the fifth time that I to the barber’s shop.
A．had; have gone
B．have; have gone
C．have; went
D．had; go
