句子成分划分It is known to us how he became a writer.麻烦帮忙划分一下句子成分
问题描述：
句子成分划分It is known to us how he became a writer.
麻烦帮忙划分一下句子成分
答
句子成分划分It is known to us how he became a writer.
麻烦帮忙划分一下句子成分