请教一道SAT语法题The Roman poet Virgil is highly esteemed today for

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请教一道SAT语法题
The Roman poet Virgil is highly esteemed today for his epic poem,The Aeneid,yet on his deathbed he himself sought to prevent its publication on the grounds (of not being) sufficiently polished.
请问括号内的怎么改感谢

of not having been
分析：他试图阻止the poem的出版,因为他认为the poem在先前没有充分修改完善.polish的动作在publish之前发生,所以要用动名词的完成式形式.

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