Who needs a cup of tea?中need为啥加s

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Who needs a cup of tea?中need为啥加s
Who needs a cup of tea?中need为啥加s

Who needs a cup of tea?中need为啥加s
这里who充当主语~
当我们不清楚到底谁需要喝茶的时候
默认是单数~
这边的who就是单数~