There are many Young Pioneers in the park.Some are walking a

同学,很高兴回答你的问题
正确答案：
There are many Young Pioneers in the park,some of whom are walking and singing.
公园里有许多少先队员,其中的一些在散步,唱歌.
解析：用定语从句合并成一个句子.
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There are many young pioneers walking and singing in the park.希望对你有帮助。谢谢。

there are many young Pioneers in the park walking and singing
希望对你有帮助