I'm really sorry that I have kept you_______(wait) for me so long.

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I''mreallysorrythatIhavekeptyou_______(wait)formesolong.I''mreallysorrythatIhavekeptyou_______(wait)fo

I'm really sorry that I have kept you_______(wait) for me so long.
I'm really sorry that I have kept you_______(wait) for me so long.

I'm really sorry that I have kept you_______(wait) for me so long.
keep sb doing sth,所以,应该是waiting

Waiting