1,---sorry,i'm late.---That's ok.i____long A haven't been waiting b didn't wait

问题描述:

1,---sorry,i'm late.---That's ok.i____long A haven't been waiting b didn't wait
B haven't waited C don't wait D didn't wait

A haven't been waiting能解释一下么表示从过去某个时间开始一直持续到现在的动作,用现在完成进行时态。