单项选择题

A．She has been working a lot recently.
B．She has been taking care of her sick mother.
C．She has been taking two night classes.
D．She has been looking for a new job.
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单项选择题
A．Graduate students.B．Undergraduate students.C．Professors.D．Library employees.
A．Graduate students.
B．Undergraduate students.
C．Professors.
D．Library employees.
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