Samsomeknowledgeofthecomputerj

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Sam _____ some knowledge of the computer just by watching others working on it.

A．brought up

B．looked up

C．picked up

D．set up

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We didn't know his telephone number, otherwise we _________ him.

A．would have telephoned	B．must have telephoned
C．would telephone	D．had telephoned

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It was essential that the application forms ___________ back before the deadline .

A．must be sent	B．would be sent
C．be sent	D．were sent

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_____________ cease（终止） advertising, prices would be significantly reduced.

A．Were they to	B．Could they
C．If they	D．Would they

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Much labor would have been saved if the electronic computers_____________ before.

A．had invented	B．were invented
C．should have been invented	D．had been invented

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There was a(n)________silence in the live interview，when no one knew what to say to the audience.

A．ashamed

B．disappointed

C．desperate

D．awkward

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