Definition: to say that something is wrong or that you are annoyed about something Level: B1
很多人投诉了噪音问题。
Lots of people have ___complained about the noise.
他总是在抱怨！
He's always ___complaining!
如果服务这么差，你为什么没有向经理投诉呢？
If the service was so bad, why didn't you ___complain to the manager?
