金黄色葡萄球菌肺炎患儿在治疗过程中突然出现呼吸困难加重,经吸痰和给予氧气吸入后无明显缓解,应考虑可能是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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