单项选择题

A．He was the first person to appear on television.
B．It was he who discovered the wonder o~ television.
C．He made the very first step towards the invention of television.
D．He developed the television and was the first person to demonstrate it.
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单项选择题
A．Mark the latest homework assignment.B．Put a cancellation notice on the classroom door.C．Make an appointment with the doctor.D．Return some exams to his students.
A．Mark the latest homework assignment.
B．Put a cancellation notice on the classroom door.
C．Make an appointment with the doctor.
D．Return some exams to his students.
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