Our teacher is working ________ a set of new textbooks for middle-school student

Ourteacherisworking________asetofnewtextbooksformiddle-schoolstudents.A.forB.overC.on... Our teacher is working ________ a set of new textbooks for middle-school students.
A. for
B. over
C. on
D. about 展开

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#热议# 不吃早饭真的会得胆结石吗？

zyb_ylj
2013-09-10 · TA获得超过1856个赞

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答案C
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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Our teacher is working ________ a set of new textbooks for middle-school student

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