不可以
could是有能力,指的是一种（过去）一直有的能力
was able to也是有能力,不过就必须有一定前提
句中的“ before the war broke out”决定只能用was able to
He was able to run away before the war broke out.可否将 was able to 改为could为什么?
He was able to run away before the war broke out.可否将 was able to 改为could为什么?
英语人气：343 ℃时间：2019-11-21 00:52:54
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