首先,are kept是被动语态,被动语态的结构是"be+动词的过去分词"；
其次,be busy doing sth 意思是 “忙于做什么事情”；
所以,如果你想分析这个句子的结构,那么the students是主语,are kept busy reviewing 是谓语,their lessons是宾语.
The students are kept busy reviewing their lessons
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