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Now I must go. I shall be late for the birthday party, (compound sentence)
【正确答案】：Now I must go, orI shall be late for the birthday party.
【题目解析】：compound sentence的意思是并列句，我们用and、or、but来连接两句并列句。根据以上两个单句的意思：现在我必须走了。（否则）我参加生日宴会就会迟到了。我们选择or（否则）来连接。