Question

找出下列文章中的所有主语从句No one knows exactly how the earth began,as it

Answer 1

一共有4个主语从句.主语从句的意思就是句子的主语由一个句子来充当.

( What it was to become )was uncertain

(What is even more important) is that as the earth cooled down,water began to appear on its surface.

3. It was not immediately obvious (that water was to be fundamental to the development of life.)

it是形式主语

4. （What many scientists believe） is that the continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas.

上面括号内的句子来充当句子的主语.