—How did you get in touch with the travel agent, Robin?
—Oh, that’s easy. I surfed the Internet and then called one the telephone
number is provided.
A. which
B. in which
C. of which
D. whose
网友回答
A. which
B. in which
(答案→)C. of which
D. whose
解析：因为of which引导定语从句，并在从句中作定语。of which the telephone number = whose telephone number。