To qualify for the job,_____.

问题描述:

To qualify for the job,_____.
A.a high school diploma is needed
B.it is required that one has a high school diploma
C.one needs a high school diploma
D.a diploma from high school is necessary
请问为什么要选C选项,其他的怎么不对?

前面是省略句,因为前后主语一样,所以答案的主语必须也能用到前面那一句
找到合适的工作 主语是人