【題目】________ 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：為了解出那道數(shù)學難題，我已經(jīng)向Russell教授咨詢過好幾次了。非謂語動詞中只有不定式可作目的狀語，題干中缺少目的狀語，故選C。

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