Sustainable electric energy systems require that we utilize renewable sources for generating electricity and ___________ it as efficiently as possible.
- ①use
- ②used
- ③to use
- ④are used
정답 ①
출처: 인사혁신처 공개 기출(공공데이터포털, 이용허락 제한 없음)
Sustainable electric energy systems require that we utilize renewable sources for generating electricity and ___________ it as efficiently as possible.
출처: 인사혁신처 공개 기출(공공데이터포털, 이용허락 제한 없음)