Don’t call me at three to four o’clock this afternoon. I the patient at that time.A. am tr

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A. am treating
B. have treated
C. will treat
(答案→)D. will be treating
解析：本题考查时态。根据时间状语at three to four o’clock this afternoon今天下午3点到四点，故事情未发生，再根据at that time在那时，故用将来进行时。