– How did you make contact with the travel agent, Tom？
– Oh, that’s easy. I surfed the Internet and then called one the telephone number is provided.
A. that
B. in which
C. of which
D. whose
网友回答
A. that
B. in which
(答案→)C. of which
D. whose
解析：句意：--你怎么和旅行社联系，汤姆？--哦，很容易，和上网搜索，然后打电话给一个提供电话号码的这句话用了定语从句，先行词是one（the travel agent,），定语从句中缺少的是（the telephone number）of the the travel agent,所以用of which引导定语从句，如果横线后面没有the，就用whose，选C。