I can't thank you much because without your help I have won the first prize.
A. too; wouldn't
B. very; shouldn't
C. that; might not
D. so; couldn't
网友回答
(答案→)A. too; wouldn't
B. very; shouldn't
C. that; might not
D. so; couldn't
解析：句意：我再怎么感谢你也不为过，因为要是没有你的帮助，我就不能赢得第一名。not… too much都不过分；without your help这是一个条件，主干是对过去的虚拟，故选A。