题目内容

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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