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    【题目】After a heated discussion, they still don’t know at all _______.

    A. what is he working outB. what he is working on

    C. what did he work onD. what he is working out

    【答案】B

    【解析】

    考查动词短语和宾语从句。句意：经过激烈的讨论，他们仍然一点也不知道他在做什么。work on表示“从事于”，work out表示“算出”，分析句子结构可知此处为宾语从句，从句中的working on缺少宾语，故B项正确。

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