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】句意:为了解出那道数学难题,我已经向Russell教授咨询过好几次了。非谓语动词中只有不定式可作目的状语,题干中缺少目的状语,故选C。

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