I wish to thank Professor Smith，without help I would never have got this far.(2012·天津)
A. who
B. whose
C. whom
D. which
网友回答
A. who
(答案→)B. whose
C. whom
D. which
解析：考查非限制性定语从句。句意：我想感谢Smith教授，没有他的帮助我不会取得这样的成绩。从句中的help是名词，与Professor Smith是所属关系，故用whose。