Sorry, I kept you so long. A. wait B. to wait C. waiting D. waited——青夏教育精英家教网—

摘要： Sorry, I kept you so long. A. wait B. to wait C. waiting D. waited

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I'm sorry I've kept you ________ for so long.

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A． waiting　　　　　　B．wait

C．to wait　　　　　　D．waited

--- I'm sorry to have kept you ________ here so long.

--- Not at all.

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