The parents were shocked by news that their son needed operation on his knee.
A. A; /
B. the; /
C. the; an
D. a; an
网友回答
A. A; /
(答案→)B. the; /
C. the; an
D. a; an
解析：此句中的news是特指后面同位语从句中提到的内容，故应该用定冠词the；儿子需要在膝盖上做一个手术，非特指，用不定冠词a。
【考点定位】本题考查冠词。
【句意】他们的儿子需要在膝盖处做一个手术，这个消息使得父母非常震惊。