【題目】You never know how much difficulty we had _________________ the problem. Luckily, we try 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】

試題分析：句意：你從來不知道我們在解決這個難題中有多少困難。幸運地是，我們在吳女士的幫助下成功解決了它。根據(jù)短語have difficulty doing sth.“做某事有困難”可知此處用動名詞短語working out，故選A。

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