Are they (l ) to their teacher?首字母是l,括号里填什么?

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Are they (l ) to their teacher?首字母是l,括号里填什么?
Are they (l ) to their teacher?
首字母是l,括号里填什么?

Are they (l ) to their teacher?首字母是l,括号里填什么?
Are they (listening,听) to their teacher?
他们正在听老师讲课吗?