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Do eye exercises every day,that will also help you keep good

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Do eye exercises every day,that will also help you keep good eyesight.改错
答案给的是把 that 改为 which,可不可以在 that 前加一个 and 呢
Do eye exercises every day,that will also help you keep good
这是非限制性定语从句,用which来引导,不能用that.前面不能加and.
" which will also help you keep good eyesight" 是进一步补充说明每天做眼保健操的好处.
再问: that 连接两个分句?不看成定语从句
再答: 这里没有2个并列关系的句子,有的是一个主句Do eye exercise every day和进一步说明这个主句的非限制性定语从句which will also help you keep good eyesight。非限制性定语从句的另外一个标志是前面的逗号。 Do eye exercises every day 和 that will also help you keep good eyesight 不是并列关系,所以。,不能用and来连接。