【題目】I had difficulties__________ the maths problem

A. working out B. work out C. to work out D. works out

【答案】A

【解析】

句意:我很難解出這道數(shù)學(xué)題。短語(yǔ)have difficulties doing sth.:做某事有困難,很難做某事;可知需用現(xiàn)在分詞working out;故選A。

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