By the time the police arrived on the scene, the burglars_______.20070306A.fledB.had fledC.has fledD

题目简介

By the time the police arrived on the scene, the burglars_______.20070306A.fledB.had fledC.has fledD

题目详情

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

20070306

 
A.fledB.had fledC.has fledD.was fleeing

题型:单选题难度:偏易来源:不详

答案

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

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