_You were foolish not to follow your parents' advice

问题描述:

_You were foolish not to follow your parents' advice
_Yes.I regret _____ that
1.to do
2.to be doing
3.to have done
4.having done

4
regret to do 对要做的事遗憾.(未做)
regret doing 对做过的事遗憾、后悔.(已做)
regret having done sth.对已发生的事感到遗憾