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B) 根据句子意思,用括号中所给单词的适当形式填空。
66. When I walked past a lake,I saw many children (swim) in it.
66. swimming
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B) 根据句子意思,用括号中所给单词的适当形式填空。
66. When I walked past a lake,I saw many children (swim) in it.
66. swimming