I am sorry that I have kept you (wait) ______for so long.waitingkeep sb．doing st

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问题 I am sorry that I have kept you (wait) ______for so long.

选项

答案 waiting

解析 keep sb．doing sth意为“让某人持续做某事”。

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IamsorrythatIhavekeptyou(wait)______forsolong.waitingkeepsb．doingst