（）to have kept you waiting so long. Oh, never mind. After all, you are here.
- A、I am happy
- B、It's a pleasure
- C、I am sorry
- D、I am welcome
正确答案:C
答案解析:有
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专升本英语
专升本英语
（）to have kept you waiting so long. Oh, never mind. After all, you are here.
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