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He was able to flee Europe before the war broke out。

= He managed to flee Europe before the war broke out。

注意:could不表示时态

1)提出委婉的请求,(注意在回答中不可用could)。

--- Could I have the television on?

--- Yes, you can. / No, you can't。

2)在否定,疑问句中表示推测或怀疑。

He couldn't be a bad man.

他不大可能是坏人。