I'm sorry I ___(keep) you waiting for such a long time
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I'm sorry I ___(keep) you waiting for such a long time
I'm sorry I ___(keep) you waiting for such a long time
I'm sorry I ___(keep) you waiting for such a long time
I'm sorry I 【have kept】 you waiting for such a long time
keep sb doing sth 让某人一直做某事
句意是:很抱歉我让你一直等了这么长时间.