I like to think _____ investment in my future.

a. it as one of  b. of it as an  c. it of an  d.as it of

답을 a라고 생각했는데 b래요.

investment가 불가산, 가산 모두 쓰인 거는 알겠는데요.. 여기서는 '투자'의 의미로 쓰였으니까

불가산이기 때문에 b는 안 되는 거 아닌가요?ㅠㅠ

그리고

(a) It was fun coming over to see your new apartment.

(b) I'm glad you enjoy it. I'm sorry that it was so messy.

....

여기서 b 가 틀린 문장이라는데요(문법 part3)

어디가, 왜 틀린건지 잘 모르겠습니다.

마지막으로

part4 문제인데요ㅠㅠ

(a) because andrew did not understand stacey's mood swings, he avoided her, which just made matters worse.

(b) He thought her bouts of emotional instability were an indication that something was wrong with her.

(c) One minute she would appear to be happy, even euphoric, and the next then she was angry and depressed.

(d)..

에서 답이 c 라는데요... 정확히 어디가, 왜 틀린건지 잘 모르겠습니다.ㅠㅠ