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When she saw her son liked reading, she did all she could ______ him.

A.help B.to help C.helping D.to helping

B

解析试题分析:考查不定式做目的状语:句意:当她看见儿子喜欢阅读,她极尽所能帮助他。这里could后面省略了do,而不定式表示目的状语,选B。
考点:考查不定式做目的状语
点评:本题是易错题,句意理解是关键。要把缺失的部分还原,找出省略成分,判断所需的成分。动词不定式的基本用法:动词不定式能起名词、形容词和副词的作用,可在句中作主语、表语、宾语补足语、定语和状语用。同时还要注意动词不定式的被动语态用法

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