先前active的系统进入service状态，如果系统故障消失，则系统可以恢复到（）状态。A、StandbyB、serviceC、activeD、以上都不对
先前active的系统进入service状态，如果系统故障消失，则系统可以恢复到（）状态。
- A、Standby
- B、service
- C、active
- D、以上都不对
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