We all feel sorry for______ for so long after your arrival.

We all feel sorry for______ for so long after your arrival.
A、keep you waiting
B、having kept you waiting
C、waiting for you
D、keep you wait
【正确答案】：B
【题目解析】：B. having kept you waiting - 这是一个现在分词的完成形式，表示一个先于主句动作完成的动作。它适合这个句子的语境，因为“让你等待”这个动作发生在“我们感到抱歉”之前。