Theystudiedwhatsince2007andfou_优题课试题网

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更新 2022-09-03
科目英语
题型单选题
难度中等
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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

D．has been happening

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A．since

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_____ still half drunk, he made his way home.

A．When

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_____ she was very tired, she went on working.

A．As

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