单选题 This certificate will prove______to you in your applying for a good job.
A) being of some use B) be of some use
C) to be of some use D) of some use

【正确答案】 C

【答案解析】[考点分析] prove的用法中有“主语+prove(to be+形容词)”，意为“……证明原来是……的”，而be of+名词相当于“be+该名词相应的形容词”，将选项填入，原句为“…prove to be useful(of some use…)”，符合prove的用法；prove的用法及be of+名词的结构。