请问为什么要用having been separated?而不是用to be separated?
问题描述:
请问为什么要用having been separated?而不是用to be separated?
Having been separated from other countinents for millions of years,Australia has many plants and animals not found in any other country in the world.
答
因为已经发生的事实“be separated from other continents for millions of years" 才造成了现在”Australia has many plants and animals not found in any other country in the world“ 这个事实,所以是过去发生...