单项选择题

A．Forty minutes.
B．One hour.
C．Twenty minutes.
D．Two hours.
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单项选择题
A．It was based on the lecture material.B．It was very easy.C．It was based on the book.D．It was very difficult.
A．It was based on the lecture material.
B．It was very easy.
C．It was based on the book.
D．It was very difficult.
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