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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there for some time，Mr. Johnson knew the place quite well．

A．Having lived	B．Living
C．To live	D．Lived

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He found them ______ at a table ______ ．

A．sat;to play chess	B．sitting;to play chess
C．seated;playing chess	D．sat;play chess

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I was about to go out _______ the telephone rang yesterday．

A．when

B．after

C．before

D．Since

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—Miss Wang，I feel very nervous with the competition approaching.
— .As long as you can finish it，it is a victory.

A．Take your time	B．Take it easy
C．No problem	D．It's hard to say

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Could you give me a hand？It seems that my strength has .

A．used up	B．run out
C．been given out	D．run out of

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