He told me the date_he joined the League,_he would never

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He told me the date___he joined the League,___he would never forget.为什么选when;which.

这个题是考核关系代词和关系副词的用法
选择用关系代词还是关系副词,只要看从句中缺少的是什么成分,假如从句中缺少主语或宾语,那就用关系代词（我们知道主语和宾语在句子里假如缺失的话,句子就不完整了,所以从句如果不完整的话就要用关系代词,这也是另一个判定方法）；而从句中如果缺少状语,我们一般就用关系副词.
这个句子中,第一个从句he joined the League是一个完整的句子,主语he 谓语join 宾语the league,所以这里缺少的是一个时间状语,因此要用关系副词when
第二个定语从句 he would never forget 中,缺少一个宾语,这个句子相当于：he would never forget （the date,用which替代）,所以这里要用关系代词which

He told me the date___he joined the League,___he would never I'll never forget the days when I joined the League.He still I will never forgert the day_____I joined the League. He said that he had joined the League in 1985. He joined the League in 2004.变同义句 Elias trusted Mandela and he joined the ANC Youth League. he told me the date ____he married mary,_____he would never He said he would never forget the day ___he spent with his g I'll never forget the days_____I joined the League.为什么填when i will never fogret the day __i joined the league是填when吗?在线等 I will never forget the day ____ I joined the League. I'll never forget the days ___ I joined the League(填介词)