题目内容
【题目】You never know how much difficulty we had____ the problem. Luckily, we managed to solve it with Mrs. Wu’s help.
A. working out B. work out C. worked out D. to work out
【答案】A
【解析】解析过程:考查非谓语动词。句意:你永远不会知道我们解决这个问题有多困难。幸运的是,在他的帮助下我们设法解决了。本题主语考查have difficulty doing somehing 这一结构,故选A
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