________ the difficult maths problem, I have consulted Professor Russell several times._刷题宝

题干

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

A：Working out

B：Worked out

C：To work out

D：Work out

上一题下一题 0.0难度选择题更新时间:2018-03-08 11:17:24

答案(点此获取答案解析）

C

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