21. (A), (B), (C)의 각 굵은 글씨 안에서 어법에 맞는 표현으로 가장 적절한 것은?
While awaiting the birth of a new baby, North American parents typically furnish a room as the infant's sleeping quaters. For decades, child-rearing advice from experts has (A) encouraged / been encouraged the nighttime separation of baby from parent. For example, a study recommends that babies be moved into their own room by three months of age. "By six months a child (B) who / whom regularly sleeps in her parents' room is likely to become dependent on his arrangement," reports the study. Yet parent-infant 'co-sleeping' is the norm for approximately 90 percent of the world's population. Cultures as (C) diverse / diversely as the Japanese, the Guatemalan Maya, and the Inuit of Northwestern Canada practice it. (113 words)
(A) (B) (C)
1) encouraged ---------- who --------- diverse
2) encouraged ---------- whom ------- diversely
3) encouraged ---------- who --------- diversely
4) been encouraged ----- who --------- diverse
5) been encouraged ----- whom ------- diverse