Children of this age should be reminded of to do in public places.A. whatB. whetherC. howD

问题补充：

Children of this age should be reminded of to do in public places.

A. what

B. whether

C. how

D. why

答案：

(答案→)A. what

B. whether

C. how

D. why

解析：句意：这个年龄的孩子应该被提醒在公共场合做什么。这里是疑问词+不定式做宾语的用法，因为不定式的动词是do（及物动词）缺少宾语，所以用what，选A。