单项选择题

A．Some students at the back cannot hear the professor.
B．The professor has changed his reading assignment.
C．Some of the students are not on the professor’s list.
D．The professor has brought extra copies of his assignment.
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单项选择题
A．He is becoming too oldB．He has trouble in hearing.C．He can no longer accomplish mental tasks.D．He is in a depressed emotional state.
A．He is becoming too old
B．He has trouble in hearing.
C．He can no longer accomplish mental tasks.
D．He is in a depressed emotional state.
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