It has become ------- common to see groups of people sitting silently together at restaurants, each one occupied by his or her mobile phone.
(A) usually
(B) seldom
(C) quite
(D) sometimes
(A) usually
(B) seldom
(C) quite
(D) sometimes
답 (C) quite
특히 each 뒤에 문장구조 상세히 좀 설명해주세요!
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