单项选择题

How can you keep the machine ______ when you are away

A．run
B．to run
C．running
D．being run
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单项选择题
The manager signed the contract in the ______ of all the staff.
A．appearance
B．presence
C．view
D．attend
单项选择题
He doesn't want to take a picture with every fan he ______.
A．runs over
B．runs into
C．comes along
D．comes up
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