한끝 문제집에서 나온 문장인데요.
therefore, they manifest no joy at your approach, and when you leave them, it is with a feeling that they can do just as well without you.

이문장에서 it is with a feeling that they can do just as well without you. 이 부분에서 it~that 강조용법인가요?
어떻게 해석되는지 도움 좀 주세요~ㅎㅎ