The boy is not to go to school.A. young enoughB. old enoughC. enough oldD. enough young

问题补充：

The boy is not to go to school.

A. young enough

B. old enough

C. enough old

D. enough young

答案：

A. young enough

(答案→)B. old enough

C. enough old

D. enough young

解析：句意：这个男孩的年龄上学不够大。Enough修行形容词时，一般放在被修辞词后面，故选B。