I'm sorry. I've left so many questions _____(unanswered, to answer) 应该选哪一个

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I''msorry.I''veleftsomanyquestions_____(unanswered,toanswer)应该选哪一个I''msorry.I''veleftsomanyquestions____

I'm sorry. I've left so many questions _____(unanswered, to answer) 应该选哪一个
I'm sorry. I've left so many questions _____(unanswered, to answer) 应该选哪一个

I'm sorry. I've left so many questions _____(unanswered, to answer) 应该选哪一个
unanswered
可以理解为下面形式:leave sth.undone