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,所以是过去发生的事情持续到现在对现在产生的影响,所以用一般完成时
请问为什么要用having been separated?而不是用to be separated?
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英语翻译用separate 可以吗
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请问为什么此题要用were ended而不用be ended?