[题目] the age of fifteen, she had written scores of articles for a newspaper.A. At B. Before C. Since D. By 题目和参考答案——青夏教育精英家教网—

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【题目】_______ the age of fifteen, she had written scores of articles for a newspaper.

A. At B. Before C. Since D. By

【答案】A

【解析】句意：在15岁时，她为报纸写了大量的文章。根据at the age of 在几岁时；before+时间点，在这里应用过去时态；since+时间，句子通常用现在完成时态；by+时间，句子通常用现在完成时态；故选A

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