患者,男,34岁,半年前|4曾做过金瓷冠修复,觋颊侧牙龈红肿、疼痛、常嵌塞食物,检查发现|4颊侧颈部龋,最可能是下列哪项原因?( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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