17. George _________ too far . His coffee is still warm .
can’t have done是对过去的否定推测；must have done过去一定做了某事；might have done过去可能做了某事；needn’t have done过去本不必做某事。根据句意, 可知答案为C。
句意: 乔治不可能走得太远了。他的咖啡仍然是温的。can’t have done是对过去的否定推测；must have done过去一定做了某事；might have done过去可能做了某事；needn’t have done过去本不必做某事。故选C。
句意理解错误