问题
选择题
Being hard-working is of the highest __________ to becoming successful.
A．important
B．to be important
C．importance
D．being importance
答案
答案：C
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。