单项选择题

They have （） production.

A．brought up
B．put up
C．speeded up
D．pulled up

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单项选择题

After our computer network （） for the third time that day, we all went home.

A．fell
B．smashed
C．collided
D．crashed

单项选择题

（） the absence of the Manager Mr. Smith is in charge of the business.

A．In
B．At
C．To
D．With

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