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When you sleep, your brain sorts through everything that happened during the day, trying to link new experiences to old memories. （2021北京卷；语法填空·人与自然）
当你睡觉时，你的大脑会整理白天发生的一切，试图将新的经历与旧的记忆联系起来。
结构解码
难点突破
真题重现 When you sleep, your brain sorts through everything happened during the day, trying to link new experiences to old memories.
解析 在定语从句中，如果先行词为all，much，anybody，anything，everything，something，nothing，none，no one等不定代词，引导词要用that，不能用which。
语法链接
复合不定代词
常见复合不定代词如下：
核心词
sort through 整理
link vt. 使联系起来
experience n. [C]经历
memory n. [C]记忆