There was nothing else I could do
→ 나도 어쩔 수가 없었어.

[예문]

A: How could you let her leave?
A: 그녀를 왜 그냥 가게 내버려둔 거야?

B: There was nothing else I could do
B: 나도 어쩔 수가 없었어.

A: I told you to make her stay until I got here.
A: 내가 여기 올 때까지 붙잡아 두라고 했잖아.

B: I know but she said something really urgent came up.
B: 알아. 그런데 갑자기 급한 일이 생겼다고 하더라고.