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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:352

--- Hello! Is Mr. John in the office?
--- Yes. But I’m sorry. He is busy _________ and can’t speak to you.

A.at once B.at present C.at the end D.at first
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Hello!IsMr.Johnintheoffice?Yes