before sleep与before sleeping哪个是对的?

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/11/07 23:46:37

before sleep与before sleeping哪个是对的?
因为sleep有双词性,我搞不懂,如果是名词性的还要加ing吗．?
具体的题目是,brush teeth before...用sleep 还是sleeping?

应该用sleep在则里应该理解为名词

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