separate是瞬间动词,不能用于完成时里!
having been done 和 done
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have been done和have been doing 和having been done和having done
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doing having done being done having been done 造句!
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have done.have been done .had done.had been done 有什么区别?怎么用?有
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have done和have been done有什么区别呢