单项选择题

A．He was operating.
B．He was with a patient.
C．He was talking to his secretary.
D．He was away on vacation.
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单项选择题
A．How Sony engineers improved sound quality.B．How a popular product was invented.C．How Masaru Ibuka made a design.D．How Sony stereos became a raging success.
A．How Sony engineers improved sound quality.
B．How a popular product was invented.
C．How Masaru Ibuka made a design.
D．How Sony stereos became a raging success.
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