——— Alice looks sad. Did you tell her about the accident?    ——— Yes， but I ________ her just before her final exams.

A．shouldn’t tell

B．shouldn’t have told

C．needn’t tell

D．mustn’t have told

恒电位仪控制台应具有较强的抗强电防（）功能，在输入端设有锯齿型火花隙、压敏电阻浪涌吸收器和隐压二级管限幅器三级雷电泄放系统。

A.极化

B.腐蚀

C.雷击

D.偏离