Question

he is not old enough togo to school

He is not old enough ________ to school．（　　）

A. gone

B. going

C. went

D. to go

Answer 1

答案：D．
根据He is not old enough ________ to school，可知这里考查了（not ）+adj/adv．+enough to do …（不）足够…去做某事…，enough后面跟to引导的不定式形式．故选D．