【题目】连词成句：they, a, great, are, birthday, having, party (.)
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【答案】They are having a great birthday party.
【解析】
根据所给的单词，they他们，a一个，great棒的，are是，birthday生日，having正在举行，party聚会，可以组成句子，They are having a great birthday party.他们正在举行一个盛大的生日聚会。故答案为They are having a great birthday party.
