In reflecting back upon these last sixteen years, I can see tragedies and happiness, and all of which is unimportant now. I merely smile a little with nostalgia when I think of them.
① 고칠 필요 없음 ② all of them are
③ and all of them is ④ all of which is
⑤ all of which are
위 문제 답이 5번이라는데 왜 그런가여?
2번은 왜 안되나여?