下列处罚当事人享有听证的权利有( )

A．警告

B．责令停产停业

C．吊销许可证或执照

D．罚款数额较大

Perce Blackborow and his companions stayed on Elephant Island for six months before rescue came, so they ________ a lot of difficulties.

A．must go through

B．may go through

C．must have gone through

D．could have gone through