单项选择题

What’s the probable relationship between the two speakers（）

A．A math teacher and his colleague.
B．A teacher and his student.
C．A student and his classmate.
D．A librarian and a student.

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单项选择题

A．His injury kept him at home.
B．He didn’t think it necessary.
C．He was too weak to see the doctor.
D．He failed to make an appointment.

What’s the probable relationship between the two speakers（） 您的浏览器不支持 audio 元素。