they are having the young pioneers' day.为什么要有冠词the呢?这句话怎么翻译啊

they are having the young pioneers' day.为什么要有冠词the呢?这句话怎么翻译啊 they are ()() the young pioneers ______ of the students are Young Pioneers. The Young Pioneers are( helping the old woman)特殊疑问句 Young Pioneers are helping the old woman.的意思 The children are Young Pioneers.(改为单数句） Where the Young Pioneers are singing now?改错句 look the young pioneers are singing and dancing ___ though all day they are in the sky怎么翻译 Every day when it grew dark,the young pioneers had the fires listen to the Young Pioneers是什么意思 They are playing football the day before yesterday.这句话错了吗?怎么