I wish to thank Professor Smith, without _______help I would never have got this far.A.whoB.whoseC.whomD.which
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B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。