all_was needed was one final push to close the deal
问题描述：
all_was needed was one final push to close the deal
A,that Bwhat Cthere Dwhich
答
选择A 这里是定语从句 先行词是all 后面要用定语从句而非宾语从句或者主语从句,排除B what
Cthere 而且all当先行词只能用that这句话怎么划分成分，All that was needed这个是定语从句吗？，was one final push to close the deal 后面的这半句的是主句吗？感觉划分的不对，应该怎么划分呢。另外这句怎么理解意思。