The old granny did all her best ________ her son to learn to look after himself.A.helpedB.helpingC.to helpD.helps
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C解析解析:从选项看,本题考查动词的非谓语形式的用法。空格前面的内容意为“这个老太太做了最大的努力”,后面的一部分的意思为“帮助她的儿子学习照顾他自己”。可见,the old granny did her best的目的是help her son to learn to look after himself.因此本题中应该使用不定式短语作目的状语。正确