(2013·高考重庆卷)The parents were shocked by________news that their son needed________operation on his knee.

A．a；/

B．the；/

C．the；an

D．a；an

请从所给的四个选项中，选择最合适的一个填入问号处，使之呈现一定的规律性（）

A．A

B．B

C．C

D．D