单项选择题

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

A．He wants to wait until the class is full.
B．He wants to take the class if someone drops it.
C．He will wait for the professor.
D．He is late and there are no more chairs.

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单项选择题

A．Affecting the mouse.B．Affecting the keyboard.C．Affecting the hard disk.D．Affecting the crust of the computer.

A．Affecting the mouse.
B．Affecting the keyboard.
C．Affecting the hard disk.
D．Affecting the crust of the computer.

Questions 11 to 18 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。

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