y train/by bike/by bus这类词组中,by后面不加任何定冠词the,这是固定用法,也是泛指一类交通方式.如I go to school by bike.泛指我是骑自行车去学校的,我可以骑凤凰牌自行车去上学,也可以是山地车,等等,不具体.
本题中,by a 7:00 train,有具体的车次时间,是7点钟那趟火车,不是10点的,特指了,于是就要符合正常的语法规则——名词不能单独出现,前面必须有定冠词或不定冠词a/the.
提问英语语法18?分析语法（要详细）7-6.My father usually goesto work by______
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