They have been working on this since . A. two hours ago B. a long time C. the light is on D. two hours before 题目和参考答案——青夏教育精英家教网—

题目内容

They have been working on this since ______.

A. two hours ago　　　　 B. a long time

C. the light is on　　　　 D. two hours before

since引导的时间状语，应表示过去的一个时间点，意为“自从……以来”。

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The sudden closure(关闭) of BT websites where copyrighted materials used to flow freely suggests a determination on the part of the government to take intellectual property rights seriously. This kind of websites is bad for us, so we should ban them.

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D. Pirate discs make it more popular among the children.

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A. Taking risks

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The group had published 90 books and 1,500 articles in scientific, scholarly, and literary magazines and had collected more than 100 patents.

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