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更新 2022-09-03
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挑错有奖

As nobody here knows what is wrong with the machine, we send for an engineer to handle the problem.

A．should

B．must

C．can

D．would

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My parents have promised to come to see me before I _________ for Africa.

A．have left

B．leave

C．left

D．will leave

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难度：未知

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Charles Babbage is generally considered to _______ the first computer.

A．to invent

B．inventing

C．to have invented

D．having invented

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难度：未知

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----I have got a headache.
---- No wonder. You ________ in front of that computer too long.

A．work

B．are working

C．worked

D．have been working

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难度：未知

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The police ________ the lost child and tried to find his parents.

A．took up

B．took in

C．took over

D．took after

题型：未知
难度：未知

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It’s very hard for Mary to work here, for ______ she does can’t satisfy her boss.

A．what

B．whatever

C．which

D．whichever

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难度：未知

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