The a teacher has on children is usually greater than that of their parents.A. useB. effo

问题补充：

The a teacher has on children is usually greater than that of their parents.

A. use

B. effort

C. effect

D. energy

答案：

A. use

B. effort

(答案→)C. effect

D. energy

解析：由have a great effect on...可知答案。