--In order to make the separate family reunited，he did ______ them.--Which one of the following is wrong？A.all he could to helpB.everything possible to helpC.his best to helpD.what he could help
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D解析A项为省略句，全句应为：he did all he could do to help them。to help为目的状语，A是正确的。B项中形容词置于everything之前，也无错误。C项do one’s best to是习语，也常为人所用。D项中的错误在于help前少了to。to help表目的。