题目内容

4.     the difficult maths problem, I have consulted Professor Russell several times.

A. Working out      B. Worked out

C. To work out       D.  Work out

4.    C考查非谓语动词。句意:为了解出那道数学难题,我去向Russell教授咨询过好几次。所填词作目的状语,用动词不定式,故选C。

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