7. Jigsaw Furnishing is well ______ for their stylish and comfortable office furniture.
(A)known (B)know (C)knowing (D)knows
24.It is necessary ______ all visitors to sign in at the security office before entering the
research and development department.
(A)for (B)to (C)so (D)that
답이 되는 이유 좀 설명해주세요 ㅜㅜ
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