The old machine won’t _______ properly if you don’t oil it regul

The old machine won’t _______ properly if you don’t oil it regularly.

A、affect
B、effect
C、function
D、practice
【正确答案】:C
【题目解析】:affect 影响,effect 产生,function 运行, practice 练习
句意:如果你不经常给这台旧机器上油,它就不能正常_____。C符合题意,不能正常运行