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Residents may also observe work crews installing flags, traffic cones, and other markers ______ specific work area.

(a) designate

(b) designated

(c) are designated

(d) to designate

답은 D인데

and 뒤에 동사 주절이랑 맞춰야되서 동사원형이 와야되는거 아닌가용? ㅜㅜ

왜 to designate가 정답인가요??