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She tried to persuade him not to smoke,but he_______listen.

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She tried to persuade him not to smoke,but he_______listen.
答案是wouldn't告诉我为什么是这个.
顺便告诉我couldn't shouldn't wouldn't的区别.谢谢了^-^
She tried to persuade him not to smoke,but he_______listen.
wouldn't do something的一层意思就是过去常常不做某事,前面说她尽力说服他不要吸烟,因为TRY用了过去时,所以用wouldn't
couldn't shouldn't 都是不许的意思,但是前者的语气更重,强调不准,后者语气更轻,强调不应该
wouldn't的意思已经说了