她在音乐课上学习如何弹竖琴。
She is learning how to play the ___harp in her music class.
他整个晚上都在不停抱怨工作上的问题。
He ___harped on about his work problems all evening.
她总是对餐厅的服务喋喋不休地抱怨。
She keeps ___harping on about the restaurant's poor service.
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