某患者|6缺失,考虑用|57作基牙设计金属烤瓷固定桥,但|5向远中倾斜,与|7没有共同就位道,应采用下列哪种附着体解决就位道问题?( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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