-Jim.come out!Let's go to play football.-Sorry.I'm working a math problem.A. out B. on C. for D. with B [解析] 句意:--吉姆.出来!我们去踢足球吧.--对不起.我正在做一道数学题.work on从事,work out解决.算出,work for 为-而工作,work with 题目和参考答案——青夏教育精英家教网—

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—Jim，come out！Let's go to play football.—Sorry.I'm working ________ a math problem.

A. out B. on C. for D. with

B 【解析】句意：——吉姆，出来！我们去踢足球吧。——对不起，我正在做一道数学题。work on从事；work out解决，算出；work for 为…而工作；work with与……一起工作。Work on a math problem做题。结合句意可知，答案为B。

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