Teachers often tell us in the river after school.A. don’t swimB. not swimC. not to swimD.

问题补充：

Teachers often tell us in the river after school.

A. don’t swim

B. not swim

C. not to swim

D. swim

答案：

A. don’t swim

B. not swim

(答案→)C. not to swim

D. swim

解析：句意：老师经常告诉我们学校后不要在河里游泳。tell sb not to do sth告诉某人不要做某事，故选C