这道选择题为什么选C,不是A?8.Professor Li _______ in doing his experiment for nearly ten years. A. insisted B. piled C. persisted D. split
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题目内容：
这道选择题为什么选C,不是A?
8.Professor Li _______ in doing his experiment for nearly ten years.
A. insisted B. piled C. persisted D. split
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