Witheconomydevelopingatgreatsp

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更新 2022-09-03
科目英语
题型单选题
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挑错有奖

With economy developing at great speed, our city has _____ quite a few changes in recent years.

A．witnessed

B．accumulated

C．arisen

D．introduced

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A．should

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As long as the laws of nature ______, there will be tornadoes.

A．exist

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Some scientists have questioned the theory ______ CO₂ is causing dangerous global warming.

A．which

B．what

C．that

D．why

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They studied what ______ since 2007 and found Australian electricity prices were among the highest in the developed world.

A．has happened

B．happened

C．had happened

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