Question

Won’t your parents be proud ________ the navy?

1. A.
   yours joining
2. B.
   for you to join
3. C.
   of your joining
4. D.
   that you having joined

Answer 1

C
形容词proud的用法是be proud of sth意思是“为……感到骄傲”。比较：take pride in sth为……感到骄傲。