―I think it’s too late to say sorry to Kate.

―Never mind. _______.

A．Good medicine tastes bitter

B．Better late than never

C．All good things come to an end

D．A man becomes learned by asking questions

暂态地电压局部放电检测，开关柜投入运行超过（）分钟。

A.5

B.10

C.20

D.30

E.60