患者,女,l3岁,上前牙咬合痛、自发痛3天。口腔检查:左上侧切牙舌面窝处深龋,探诊(一)叩诊(++)。最可能的病因为( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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