【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(lái)不知道我們?cè)诮鉀Q這個(gè)難題中有多少困難。幸運(yùn)地是，我們?cè)趨桥康膸椭鲁晒鉀Q了它。根據(jù)短語(yǔ)have difficulty doing sth.“做某事有困難”可知此處用動(dòng)名詞短語(yǔ)working out，故選A。

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