The boy is to look after his sister.A. enough oldB. enough young　C. young enoughD. old en

问题补充：

The boy is to look after his sister.

A. enough old

B. enough young

C. young enough

D. old enough

答案：

A. enough old

B. enough young

C. young enough

(答案→)D. old enough

解析：enough的意思是足够的，可做形容词和副词，一般放在被修饰词的后面。Old年老的；young年轻的。句意：这个男孩年龄足够大照顾他的妹妹了。故选D。

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