单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．A teacher and student.
B．An employer and employee.
C．A grandparent and grandchild.
D．Two new friends.
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单项选择题
A．situationsB．circumstancesC．casesD．occasions
A．situations
B．circumstances
C．cases
D．occasions
单项选择题
A．atB．ofC．inD．with
A．at
B．of
C．in
D．with
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