【題目】They had much difficulty ____________ the problem and they needed our 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:他們有很多困難解決這個問題,他們需要我們的幫助。have difficulty doing sth做某事有困難,所以選A。

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