________, Henry studied even harder after he entered the university.A.That always a diligent studentB.Always a diligent studentC.Always to be a diligent studentD.Diligent student as he is
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B解析B考查省略句。A项缺少主语和谓语（he was）；C项to be表将来；D项应该是Diligent as he is“尽管他很勤奋” ；B项是Although he was always a diligent student的省略形式。当主语一致，且谓语是be动词时，常用省略形式。“尽管Henry一直都是很勤奋的学生，但到了大学他学习更努力了。”