单选题_____ as the most ex

问题补充：

单选题_____asthemostexcellentstudentinheruniversity,asmostclassmateshadexpected,madeherparentsveryhappy.A.Mary was chosenB.Mary chosenC.Mary being chosenD.Mary’s being chosen

答案：

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。