Luckily, the people there did ______ help him.A.that they couldB.which they could toC.what they could D.what they could to
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D解析试题分析：考查句子结构。本题中what they could后面省略了do，形成宾语从句what they could do作为动词did的宾语。后面的不定式to help him在句中做目的状语。句意：幸运地是，那里的人们做了他们能做的所有事情来帮助他。巩固D正确。考点：考查句子结构
点评：本题中关键是要注意do的承前省略以及不定式在句中做目的状语的形式。本句还可以转换成the people there did all they ccould to help him.这样的定语从句的形式。