Larger in area than Europe,the icy continent（surrounds） the South Pole is called Antarctica

题目

Larger in area than Europe,the icy continent（surrounds） the South Pole is called Antarctica
请问 surrounds 为什么要改为 that surrounds

答案

that surrounds the South Pole是定语从句,修饰continent.如果直接填surrounds,则这个句子出现了两个谓语（surrounds和 is called）,这是英语语法所不允许的.
当然,如果不用定语从句也可以,那么就要写成surrounding.surrounding the South Pole是现在分词短语作定语,修饰continent.