years ago they knew many things about the moon.they knew how big it was and how far it was from the earth.中的it was 放在how big ,how far
问题描述：
years ago they knew many things about the moon.
they knew how big it was and how far it was from the earth.中的it was 放在how big ,how far
答
how big it was how far it was from the earth 是宾语从句 是knew 的宾语用陈述句语序
答
写成特殊疑问句为：How big was it?How far was it from the earth?
写成陈述语序的宾语从句为：how big it was 就是说how big其到了引导从句的作用,主语it要放在表语was的前面；而How far was it from the earth?也是同样的道理.