Thenewsystemneedstobeinoperati

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The new system needs to be in operation for five months ________ it can be updated.

A．as	B．while
C．before	D．once

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_______, everything would have been all right.

A．He had been there	B．There he had been
C．Been there he had	D．Had he been there

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Don’t believe him. He is good at_________ all kinds of excuses.

A．picking up

B．taking up

C．making up

D．bringing up

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Their performance was much better than_________.

A．expected

B．it expected

C．expecting

D．it is expected

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Could I have a cigarette? I seem_________.

A．to run out	B．to have run out
C．to have run out of	D．to have been run out

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Are you satisfied with the way_______ he explained the problem?

A．which

B．by which

C．in that

D．/

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