题目内容：

Tom is a good friend of mine,____I can turn for help whenever I am in trouble.
Afor whom Bto whom Cwhom Dwith whom
选B

优质解答

Tom is a good friend of mine,_to whom __I can turn for help whenever I am in trouble.
将后面这个从句补全比较好理
I can turn to Tom for help （向**求助）,所以这里选择B