问题描述：
He _____ without saying good-bye to them,for he always has good manners.A.
He ___ without saying good-bye to them,for he always has good manners.
A．mustn’t have left B．may not have left C．shouldn’t have left D．can’t have left
为什么选D?选C 他本不该不辞而别 (却不辞而别) 有什么不对吗?
He ___ without saying good-bye to them,for he always has good manners.
A．mustn’t have left B．may not have left C．shouldn’t have left D．can’t have left
为什么选D?选C 他本不该不辞而别 (却不辞而别) 有什么不对吗?
问题解答：
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