He was a good swimmer so he -swim to the river bank when the

问题描述:

He was a good swimmer so he -swim to the river bank when the boat sank.A.couldBmightCshouldDwas ab
A. could B. might C. should D.was able to.答案是D.为什么A 不对,could 比be able to 语气弱,有这点区别吗? 谢谢
1个回答 分类:英语 2014-10-30

问题解答:

我来补答
could偏重于意愿
be able to偏重于能力
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