고수님들 도와주세요
19.The security department is in the process of _____ a new set of regulations and safety guidelines for the office.
A)establishment B)establishes C)established D)establishing
정답은 D)establishing 이지만... 왜 A)establishment 는 안되나요 ???? ㅠㅠㅠㅠ
아 ㅠㅠ 이해가 너무 안가네요 ㅠㅠㅠ
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