求助大全语法一题

葛佳

11. Researchers agreed that the study of now treatments for heart attach patients was extremly impotant but more research was needed to determine that balloon angiopasty preceded with ultrasound was or was not any better for heart atteck patients than the balloon procedure by itself.
A.more research was needed to determine that balloon angiopasty preceded with ultrasound was or was not any better for heart atteck patients than
B.more research was needed for determining whether or not balloon angiopasty preceded by ultrasound is any better for heart atteck patients than is
C.that more research was needed to determine whether balloon angiopasty preceded by ultrasound is any better for heart atteck patients than
D.that more research was needed to determine that balloon angiopasty preceded with ultrasound was any better for heart atteck patients than
E.that more research was needed for determining that balloon angiopasty preceded by ultrasound is or is not any better for heart atteck patients than is

葛佳

key B

B中不是有 whether or not这个是重复吗？必错啊？有问题？

than 后面要接 is 只有B和E
E比b更累赘么？
还是有其他错误？

sissizhx

mm, the key is C instead of B.
please refer to Prep # 250.