Ourteacherisworking________asetof

发布时间:2020-07-26 12:05:04

Our teacher is working ________ a set of new textbooks for middle-school students.A.forB.overC.onD.about

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C解析思路分析:根据空白后的语境可以判断出,此空应填介词on,work on表示“从事于”是固定的动词短语.这句意思是“我们的老师正在为中学生编写一套新课本”.
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