That boy is notto go to school He is only three years old．A. young enough B. old enoughC.

问题补充：

That boy is notto go to school． He is only three years old．

A. young enough

B. old enough

C. enough young

D. enough old

答案：

A. young enough

(答案→)B. old enough

C. enough young

D. enough old

解析：句意：这个小男孩年龄不够大，不能去学校。他只有三岁。enough+名词。形容词/副词+enough.足够的....。