【題目】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】解析過程：考查非謂語動詞。句意：你永遠不會知道我們解決這個問題有多困難。幸運的是，在他的幫助下我們設(shè)法解決了。本題主語考查have difficulty doing somehing 這一結(jié)構(gòu)，故選A

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