◎ 题干
He was a good swimmer so he _____ swim to the river bank when the boat sank.    
[     ]
A. is able to    
B. could  
C. was able to    
D. can
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“He was a good swimmer so he _____ swim to the river bank when the boat sank.[ ]A. is able to B. could C. was able to D. can …”主要考查了你对  【动词短语】【一般过去时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。