Why 疑问副词作状语 was 谓语 the origin of life主语 a sample step 表语 in the Earth's history 状语 把句子换成陈述句,成分会更加明了: The origin of life was a sample step in the Earth's history
Why was the origin of life a sample step in the Earth's history? 为什么原始生活在地球历史上是一种简单生活方式。 这是一个疑问句结构,加了个why+疑问词 正常的陈述语句应该是The origin of life was a sample step in the Earth's history. 原始...