单项选择题

What happened to the man four years ago

A．He had a minor operation.
B．He had pneumonia.
C．He had a car accident.
D．He had long aftereffects.
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单项选择题
What is the most common type of computer network used in companies
A．The databases of information.
B．The public access networks.
C．The super computer networks.
D．Intranets.
填空题
Then you should turn the stool to your______.
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