The machine has been used many years．It's no wonder that it doesn't work well ________．A.regularlyB.constantlyC.occasionallyD.frequently
网友回答
C解析考查副词辨析。Occasionally“偶尔”；regularly“定期地”；constantly“不断地，经常地”；frequently“频繁地，经常地”。根据句意“这台机器用了好多年啦，难怪(它)偶尔不工作”。