– I was trying to repair that stupid machine but I failed.-- Well you.A. needn’t do tha

问题补充：

– I was trying to repair that stupid machine, but I failed.

-- Well, you.

A. needn’t do that

B. needn’t have done

C. needn’t have

D. needn’t

答案：

A. needn’t do that

B. needn’t have done

(答案→)C. needn’t have

D. needn’t

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