核心问题
（A）He had been graduated from Maryland College in the Class of 1868. (ALD)（他毕业于马里兰学院1868级。）
(B) She recently graduated from law school. (Collins) (她最近毕业于法学院。)
词典解答
现代语言学家们认为, be graduated from 是一种故作高雅的写法, 因而比较罕见, graduate from 才是正常用法:
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He graduated from Oxford. (ALD) 他毕业于牛津大学。
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He graduated from Yale at sixteen. 他十六岁毕业于耶鲁大学。