Themachinehasbeenusedmanyyears.It'snowonderthatitdoesn'...

问题详情：

The machine has been used many years. It's no wonder that it doesn't work well ________．

A．regularly  B．constantly

C．occasionally  D．frequently

【回答】

C　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。句意：这台机器用了好多年了，难怪(它)偶尔运转不良。

知识点：副词

题型：选择题