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:考查定语从句。先行词为 a single person在从句中作宾语,“向某人求助”应该用turn to sb for help ,因此先行词作to的宾语。答案选D。