Tell the boy the news. He is to understand it.A. enough oldB. enough youngC. old enoughD.

问题补充：

Tell the boy the news. He is to understand it.

A. enough old

B. enough young

C. old enough

D. young enough

答案：

A. enough old

B. enough young

(答案→)C. old enough

D. young enough

解析：old年老的，旧的；young年轻的；enough足够的，做副词修饰形容词时，一般放在被修饰词的后面。句意：告诉这个孩子这个消息。他已经足够大，能理解了。结合语境可知选C。