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The ship sank ,but fortunately he ______ to the

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The ship sank ,but fortunately he ______ to the
The ship sank ,but fortunately he ______ to the shore.
A.was able to swim
B.could swim
为什么用A不用B
如果指在过去的某一个具体场合某人成功地做成了某事,一般不用could,而用were(was) able to
如:
The fire spread quickly throughout the hotel.Fortunately,all the people in it were able to escape from it.
注意,它们的否定式没有区别,如:
He was so drunk that he couldn't (wasn't able to) find the front door.
请在客户端右上角评价点“满意”即可
再问: 3.The managers discussed the plan that they would like to see _____ the next year. A.carry out B.carrying out C.carried D.to carry out 怎么选呢
再答: C. 要解释请另发帖
再问: http://zhidao.baidu.com/question/1795876128584777267.html?quesup2&oldq=1