I think this is the very work that we must finish her.
A. to help
B. help
C. helping
D. helped
网友回答
(答案→)A. to help
B. help
C. helping
D. helped
解析：句中空格处填的动词help 并不是 finish 的宾语，正确的句子分析是：that I must finish 是修饰名词 the very work 的定语从句，finish 的宾语是引导该定语从句的关系代词 that，其后的不定式 to help her 是目的状语。