We left the day that he arrived. 请问句中的 that 是什么词?
上面的 that 可以看作是关系副词。这种用法的 that 用来引导定语从句并在定语从句中充当状语。它所修饰的名词常常是 day, year, time, moment, speed, way, reason, place, direction, distance 等等：
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I stay at home on the days that I am not busy. (ELD) 我工作不忙的日子就呆在家里。
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He went home the same evening that he heard the news. (Dreiser) 他听到这消息的那个晚上就回家了。
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During the years that he had been in the army, he got acquainted with her. 他是在部队的那几年里认识她的。
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I can't think of many places in the world that I would like to live. 我想不出世界上会有许多地方是我愿意居住的。
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He doesn't see things the way that we see them. (《新英汉辞典》) 他看问题跟我们不同。
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He spoke in such a way that they were offended. 他说话的方式使他们很生气。
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The reason that they didn't go to see the house is that they prefer to live in an apartment. (CGEL) 他们没有去看那所房子的原因是他们愿意住公寓房。
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The direction that a force is acting can be changed. 力的作用方向是可以改变的。