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We will never forget the days we devoted . [ ] A.to working on the problem B.to

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We will never forget the days we devoted . [ ] A.to working on the problem B.to

We will never forget the days we devoted ________.

[]

A.to working on the problem

B.to work on the problem

C.on working the problem

D.in working on the problem

试题答案

答案:A