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  – Sir, we have failed to work out this problem.

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  – Sir, we have failed to work out this problem. What is exactly the right way?
--- Look. Only in this way ________ , but you boys _____ a wrong way.
A.you can work it out; take B.you can work out it; take
C.can you work it out; take D.can you work it out; took
  – Sir, we have failed to work out this problem.
D

第一空考查倒装句,only + 状语放在句首,使用部分倒装,可排除A和B两项,第二空考查时态,根据语境用错方法的动作在过去,所以用一般过去式,故选D。