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

发布时间:2020-08-15 01:05:27

By the time the police arrived on the scene, the burglars    .
20070306
 
A. fled
B. had fled
C. has fled
D. was fleeing

网友回答

A. fled
(答案→)B. had fled
C. has fled
D. was fleeing
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。
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