Being hard-working is of the highest to becoming successful. A. importantB. to be importa

问题补充：

Being hard-working is of the highest to becoming successful.

A. important

B. to be important

C. importance

D. being importance

答案：

A. important

B. to be important

(答案→)C. importance

D. being importance

解析：考查固定词组：of +抽象名词=形容词，of the highest importance=the most important，最重要，句意是：要想成功勤奋是最重要的。选C。