问题补充:
He has worked the maths problem for nearly an hour but he simply can’t work it.
On ;atB. on ;out C. at ;up D. for ;out
答案:
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。
如果觉得《He has worked the maths problem for nearly an hour but he simply can’t work it.On ;atB. on》对你有帮助,请点赞、收藏,并留下你的观点哦!