Edison was a clever boy, and ______ he was fourteen, he had learned advance mathematics by himself. ...
2022-12-31 19:57:52 24次 2012-2013学年山东省兖州市高三9月入学诊断检测英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Edison was a clever boy, and ______ he was
fourteen, he had learned advance mathematics by himself.
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A．whenever
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B．by the time
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C．the moment
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D．ever since
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