They asked her to take charge of planning the trip, which she was very happy to do.
이 문장에서요 which가 목적격 관계대명사의 계속적 용법 맞죠? 그리고 이 문장을 다음과 같이 바꾸어 쓸 수 있나요?
They asked her to take charge of planning the trip, and it she was very happy to do.
아니면 목적격이기 때문에...They asked her to take charge of planning the trip,and she was very happy to do it. 이 되야 하나요?