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20.You never know how much difficulty we had _______the problem.Luckily,we managed to solve it with Mrs Wu's help.(  )
A.working outB.work outC.worked outD.to work out

分析 你不知道解答出那道题我们有多大的困难,幸运的是,在胡老师的帮助下,我们最终解答出来了.

解答 答案:A.
本题考查非谓语动词的用法.根据语境推测句意是"你不知道解答出那道题我们有多大的困难,幸运的是,在胡老师的帮助下,我们最终解答出来了.",由设空处前面的how much difficulty we had  判断此题考查句式"have(no) trouble/difficulty doing 做某事有(没有)困难"; 所以选A.

点评 本题考查非谓语动词的用法,抓住句中的关键词并联系相关的语法知识可得出正确的答案.平时注意对此类短语或句式用法的总结与归纳.

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