In the dark street there wasn’t a single person Mary could turn for help.
A. to whom
B. to which
C. on whom
D. on which
网友回答
(答案→)A. to whom
B. to which
C. on whom
D. on which
解析:考察定语从句,该句为定语从句, 先行词是single person, 在从句中作turn to的宾语,turn to sb for help意为向某人求助,to 是介词,后面指人的时候只能选择whom,所以选择A