单项选择题

A．They are classmates.
B．They are teacher and student.
C．They are strangers.
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单项选择题
A．$ 50.B．$ 30.C．$ 20.
A．$ 50.
B．$ 30.
C．$ 20.
单项选择题
A．Frank should go to the library.B．Frank should close the window.C．Frank should stay at home.
A．Frank should go to the library.
B．Frank should close the window.
C．Frank should stay at home.
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