The reason why the earth is different from other planets______(go) around the sun is that water
问题描述：
The reason why the earth is different from other planets______(go) around the sun is that water
began to appear on its surface after the earth cooled down.这空填什么形式?为什么?
答
going,作定语修饰plants,相当于定语从句 plants which/that go around the sun