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题目
题型:不详难度:来源:
He has worked         the maths problem for nearly an hour but he simply can’t work it      .
On ;at           B. on ;out            C. at ;up              D. for ;out
答案
B
解析
考查介词。work on从事,忙于;work out解决。句意:他已经做那条数学问题接近1个小时了,但他还没有做出来。
核心考点
试题【He has worked         the maths problem for nearly an hour but he simply can’t w】;主要考察你对介词和介词短语等知识点的理解。[详细]
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