The girl is only two years old. She is to go to school. A. old enoughB. young enoughC. to

问题补充：

The girl is only two years old. She is to go to school.

A. old enough

B. young enough

C. too old

D. too young

答案：

A. old enough

B. young enough

C. too old

(答案→)D. too young

解析：old老的，旧的；young年轻的，enough足够的，作副词修饰形容词时，一般放在形容词后面。句意：这个女孩只有两岁大。她太小而不能去上学。固定句式too……to太……而不能，结合语境可知选D。