Mary's studying () the math exam.A on B in C at D for

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Mary's studying () the math exam.A on B in C at D for

Mary's studying () the math exam.A on B in C at D for
Mary's studying () the math exam.A on B in C at D for

Mary's studying () the math exam.A on B in C at D for
D for 原句的意思是Mary在为她的数学考试学习
B和C 跟地点
A 跟学科特定的知识或者其他之类的