单项选择题

A．student’s
B．professor’s
C．assistant’s
D．librarian’s
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单项选择题
When does the conversation take place
A．In the middle of the semester.
B．At the beginning of exams.
C．At the end of the school year.
D．In the middle of summer vacation.
单项选择题
A．suggestionB．contextC．abstractD．information
A．suggestion
B．context
C．abstract
D．information
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