A 前面是has never 是否定 ,所以反问时用肯定 .后面的回答要做到“yes/no”与后面的回答内容一致 后面是肯定的回答,说他努力学习没有迟到,所以用yes答案是no 想清楚了告诉我那就是no 是对 be late for his class的回答 意思是no, he hasn't been late for his class就是说He has been very hard-working since he came to the university. 是陈述句 但是意思是他勤奋没有迟到 要和上个问题呼应 不能单看句式？就是说He has been very hard-working since he came to the university. 是陈述句，但是要和上个问题呼应 不能只看句式？对 你要看意思 它想说 李明没迟到 所以用NO