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一道关于情态动词的英语题

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一道关于情态动词的英语题
He was a good swimmer so he _________ swim to the river bank when the boat sank.
A. could B. might C. should D. was able to
选D为什么不选A
强调能力不应该选择A吗?
一道关于情态动词的英语题
e able to 强调结果,成功做成某事
could 强调能力,可能
The cildren were able to run out of the house before it was burnt down.