I can’t thank him too much, I couldn’t have finished the project in time.
A. without his help
B. with his help
C. without whose help
D. with whose help
网友回答
A. without his help
B. with his help
(答案→)C. without whose help
D. with whose help
解析：本题中定语从句的先行词是him，在定语从句whose指代先行词作为名词help的宾语。句义：我非常感谢他，要是没有了他的帮助，我不可能即使完成那个计划。根据I couldn’t have finished the project in time说明前面应该使用without表示否定的意思。故C正确。