He has worked the maths problem for nearly an hour but he simply can’t w
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。 |
举一反三
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