震后获救幸存的母亲,常反复想起在自己身边遇难的女儿,做相关的恶梦;她尽力回避任何与地震、女儿有关的东西;对生活丧失希望和信心,这是 ( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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