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【题目】—Where’s Mike?

—He is working _____ physics _____ in the classroom.

A. in; problemB. for;problemC. in; problemsD. on; problems

【答案】D

【解析】

句意:——迈克在哪儿?——他正在教室里做物理题。考查介词和名词辨析。work in把…加进;work for为…而工作/效劳;work on致力于/从事。problem是可数名词,前面没有不定冠词修饰,句中需用复数形式,可排除前两项。根据句意语境,可知work on符合句意,故选D

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