题目内容

【题目】________ the difficult maths problem, I have consulted Professor Russell several times.

A. Working out

B. Worked out

C. To work out

D. Work out

【答案】C

【解析】考查非谓语动词。题干意思是:为了解出那个数学难题,我去向Russell教授咨询过好几次。所填词做目的状语,用动词不定式,故选C。

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