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

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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。