In the dark street, there wasn’t a single person she could turn for help.A. thatB. whoC.

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A. that
B. who
C. from whom
(答案→)D. to whom
解析：turn 作“求助；求教”解时，后要接介词to，如：turn to sb. for help/advice。因为 to sb.是定语从句要求。