20.________ the difficult maths problem,I have consulted Pro

20.________ the difficult maths problem,I have consulted Professor Russell several times.
A.Working out B.Worked out C.To work out D.Work out

大白兔妹妹 1年前已收到2个回答举报

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释然了花朵

共回答了13个问题采纳率：92.3% 举报

答案是C ,表目的.

1年前

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dubeilei 幼苗

共回答了17个问题采纳率：94.1% 举报

c to加动词表目的，意思是为了解决这些困难的数学题，我已经请教了Russell教授好几次了。

1年前

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