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He is able to axplain the ______(原因) because he was there at

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He is able to axplain the ______(原因) because he was there at that time.
He is able to axplain the _reason_(原因) because he was there at that time.
再问: 为什么不加s
再答: 没有明确说明单复数,加不加s都可以
再问: 为什么我加了s算错
再答: 不清楚,按照我的理解加不加都没有问题。。。