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.](/uploads/image/z/7455852-36-2.jpg?t=I%27m+sorry+I-------------%28keep%29you+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-------------(keep)you waiting for such a long time.
过去式kept