B
本题考查主谓一致中的意义一致原则，不定代词either、neither、each、one、the other、another以及所有的复合不定代词作主语时，谓语动词应根据意义一致的原则采用单数形式，排除A。选项C是非谓语动词的一种，不能单独作谓语，亦应排除。根据答语中的时态又可排除选项D。
—Each of the students, working hard at his or her lessons, _
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