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When he was 35 years old, he became a great inventor in China.
________ ________ ________ ________ 35 years old, he became a great inventor in China.
答案:At,the,age,of
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句型转换
When he was 35 years old, he became a great inventor in China.
________ ________ ________ ________ 35 years old, he became a great inventor in China.