30.---I tried out the maths problem but I failed. ---Why not it some other way? A.working, to try doing B.to work, try doing C.to work , try to do D.working, to try to do 查看更多

 

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-I tried ________ out the maths problem but I failed.

-Why not ________ it some other way?

[  ]

A.working, to try doing

B.to work, try doing

C.to work, try to do

D.working, to try to do

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