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By the time the police arrived on the scene, the burglars . 20070306

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By the time the police arrived on the scene, the burglars . 20070306

By the time the police arrived on the scene, the burglars_______.

20070306

试题答案

B

解析:

过去完成时表示“过去的过去”。flee(逃跑)的不规则变化是:fled, fled。