If a thing is worth it must be well .A. doing; doneB. to do; doingC. to do; doneD. being

问题补充：

If a thing is worth , it must be well .

A. doing; done

B. to do; doing

C. to do; done

D. being done; doing

答案：

(答案→)A. doing; done

B. to do; doing

C. to do; done

D. being done; doing

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