根据句意及首字母提示补全单词.What is seven and eight?It's

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根据句意及首字母提示补全单词.What is seven and eight?It's
根据句意及首字母提示补全单词.What is seven and eight?It's

根据句意及首字母提示补全单词.What is seven and eight?It's
fifteen.根据句意:7+8=15.