句型转换 While they were studying the footprints, they became convinced that they exist． While the footprints, they became convinced that they exist．题目和参考答案——青夏教育精英家教网——

题目内容

句型转换

While they were studying the footprints, they became convinced that they exist．

While ________ the footprints, they became convinced that they exist．

答案：studying

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