I wish to thank Professor Smith, without help I would never have got this far.
A. who
B. whose
C. whom
D. which
网友回答
A. who
(答案→)B. whose
C. whom
D. which
解析：考查定语从句。without whosehelp=and without his help。whose引导的是非限制性定语从句，
在句中作“help”的定语，其先行词为“Professor Smith”。句意：我真得感谢史密斯教授。如
果没有他的帮助，我就永远不会（在学术上）走得这么远的。