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

问题补充：

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

A. that

B. who

C. from whom

D. to whom

答案：

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。