Dr. Yuina Hashiomoto recently added another doctor to her practice, ____ allowing more patients to be seen.여기서 정답이 thus인데 which, so that, that은 왜 안되나요.. 각각 설명해주세요ㅜㅜ
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That은 콤마뒤에도 못가고 ing앞에도 못와요