（2014届山东省潍坊市高三3月模拟考试英语试卷）
Tom had been studying French hard for nearly three years he mastered it．
| A．after | B．when | C．since | D．before |
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（2014届山东省潍坊市高三3月模拟考试英语试卷）
Tom had been studying French hard for nearly three years he mastered it．
| A．after | B．when | C．since | D．before |
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