_____ as the most excellent student in her university, as most classmates had expected, made her parents very happy.
A.Mary was chosen
B.Mary chosen
C.Mary being chosen
D.Mary’s being chosen
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D解析-ing形式的复合结构作主语时，其逻辑主语常用名词所有格或形容词性的物主代词。as most classmates had expected为非限制性定语从句。