30. from other continents for millions of years Australia has many plants and animals no

问题补充：

30. 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

答案：

A. Being separated

B. Having separated

(答案→)C. Having been separated

D. To be separated

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