saara took a couple of steps back, and looked at me with wide eyes.
i realized then that (가) something wrong so i shook her hand instead.
saara was really looking at me as if i was some kind of fool.
i think we both felt very uncomfortable ; at least i did!

여기서 (가)에 들어갈 내용으로 정답이
had done 으로 되어 있습니다만...
아무리 생각해도 이해가 가질 않네요..
혹시 정답이 잘 못 된것은 아닐까요?