He ________ without saying goodbye to them, for he always has good manners .
A.mustn't have leftB.may not leaveC.shouldn't have leftD.can't have left在线课程D
解析：
导解：没有向他们告别，不会离开．否定的推测，从后半句可知他很有礼貌，所以应用can't．
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