_______ from other continents for millions of years, Australia has many plants and animals not found in any other country in the world.

A．Being separated

B．Having separated

C．Having been separated

D．To be separated

（），原意是人民的权力或多数人的统治，是一种多数人掌握公共权力的国家制度，具有鲜明的阶级性。