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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:1954

— Can I make an appointment with Dr. Smith this afternoon?
— Sorry, I’m afraid he is not ______ because he has a patient to operate on.

A.convenient B.available
C.accessible D.valid
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—CanImakeanappointmentwithDr.S