We would like to thank the founder of our library, without help none of this would have been possible.
A. which
B. whom
C. whose
D. that
网友回答
A. which
B. whom
(答案→)C. whose
D. that
解析：考查定语从句。题意：我们要感谢该图书馆创始人，没有他的帮助这一切都没有可能。定语从句中名词whose=the founder’s, 修饰名词help。C项正确。