The teacher often warns the children football in the street.A. to playB. not to playC. not

问题补充：

The teacher often warns the children football in the street.

A. to play

B. not to play

C. not play

D. don’t play

答案：

A. to play

(答案→)B. not to play

C. not play

D. don’t play

解析：本题考查的是固定词组搭配，warn sb (not) to Do Sth,故选B