his sister _______(serve) a cup of tea to him

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his sister _______(serve) a cup of tea to him
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his sister _______(serve) a cup of tea to him
his sister _______(serve) a cup of tea to him

his sister _______(serve) a cup of tea to him
第三人称单数

serves

serves或者served

我觉得应该是served,用 过去式比较好

serves served皆可,因为没有时态的限制,单纯结合句子的上下语境无法判断句子时态。