用所给单词的适当形式填空 While in the street, he happened to meet one of his friends.
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用所给单词的适当形式填空
While _______ in the street, he happened to meet one of his friends. (walk)
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用所给单词的适当形式填空
While _______ in the street, he happened to meet one of his friends. (walk)
答案: