It is dangerous to allow the children who are ________ swimming in the river.
A.enough old to go
B.not old enough to go
C.not enough old to go
D.not old enough going
网友回答
B解析考查enough的位置。首先否定词not应跟在be动词后面，故排除A；enough修饰形容词应放在形容词的后面，故排除C；enough to足够…以至于…，不定式做结果状语。故选B。