Therearealotofcomputersinthela

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There are a lot of computers in the lab,and they need professional　　to make sure they can be in a good state.

A．operation	B．maintenance
C．service	D．advice

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A．were; was

B．are; is

C．were; is

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A．or

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A．deep; deep

B．deeply; deeply

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— ____________.

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A．that

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