【題目】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】

考查動(dòng)詞短語和賓語從句。句意：經(jīng)過激烈的討論，他們?nèi)匀灰稽c(diǎn)也不知道他在做什么。work on表示“從事于”，work out表示“算出”，分析句子結(jié)構(gòu)可知此處為賓語從句，從句中的working on缺少賓語，故B項(xiàng)正確。

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