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질문 내용 :
When Louis Pasteur introduced the idea of germs in the 1800s, people realized that all animal-hair toothbrushes eventually build up tiny bacteria, [which / in which] in turn could cause mouth diseases.
->왜 which가 정답인가요?
Washing animal-hair brushes in boiling water could leave them too [soft / softly] or destroy them entirely.
->답이 soft인 이유가 too 뒤에는 형용사가 와야하니까..가 맞나요?
This problem was not solved until the 1930s, when the soft nylon toothbrush was [inventing / invented] in the US.
->답이 invented 인 이유가 수동이니까이죠!...맞죠?
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