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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

A

解析试题分析:句意:你不知道做出这个问题有多么困难。幸运的是,我们在吴老师的帮助下,把它解决了。work out 计算出,做出。本句中使用的句型是have difficulty in doing sth. 做某事有困难,句型中的in 可以省略。因此这里应该用动名词形式。故选A。
考点:考查动词短语。

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