请根据以下内容回答{TSE}题:王女士30岁,孕12周,下腹阵发性疼痛伴阴道大量出血,呈贫血貌,妇科检查:宫口已开,有组织堵塞宫口,子宫较孕周略小{TS}应首先考虑可能为( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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