The boy is to look after himself .A. enough old B. enough youngC. old enoughD. young enou

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A. enough old
B. enough young
(答案→)C. old enough
D. young enough
解析：本题的含义为那个男孩大了足以照顾他自己，enough是副词用来修饰其他副词或形容词时应该放在被修饰词的后面，修饰名词位置不限，故本题选C。