If a student ____ in the exam, he won’t escape punishment.

A．gets caught to cheat 　

B．gets caught cheating

C．gets to catch cheating　

D．gets catching cheated

对已经触发导通的晶闸管，如果阳极电流减小到维持电流以下，晶闸管是（）状态。

A.导通

B.开关

C.截止