一道语法jj！

1.Researchers agreed that the study of new treatments for heart attack patients was extremely important but more research was needed to determine that balloon angioplasty preceded with ultrasound was or was not any better for heart attack patients than the balloon procedure by itself.
A. more research was needed to determine that balloon angioplasty preceded with ultrasound was or was not any better for heart attack patients than
B. more research was needed for determining whether or not balloon angioplasty preceded by ultrasound is any better for heart attack patients than is
C. that more research was needed to determine whether balloon angioplasty preceded by ultrasound is any better for heart attack patients than
D. that more research was needed to determine that balloon angioplasty preceded with ultrasound was any better for heart attack patients than
E. that more research was needed for determining that balloon angioplasty preceded by ultrasound is or is not any better for heart attack patients than is

这个题目有争议，大家觉得选B 还是 C

我倒是偏向于B，虽然由efficiency的错误

但是C似乎，评星队成的有问题

agree that..... 如果是and that....就对了，可1篇篇来个but that，总觉得语义上有点别扭阿

不过语法啊，最弱项了，完全没有主张

C

B的whether or not 肯定不对.