GWD Researchers agreed that the study of new treatments for heart attack

sandraqiuoffer

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.

• Amore research was needed to determine that balloon angioplasty preceded with ultrasound was or was not any better for heart attack patients than
• Bmore research was needed for determining whether or not balloon angioplasty preceded by ultrasound is any better for heart attack patients than is
• Cthat more research was needed to determine whether balloon angioplasty preceded by ultrasound is any better for heart attack patients than
• Dthat more research was needed to determine that balloon angioplasty preceded with ultrasound was any better for heart attack patients than
• Ethat more research was needed for determining that balloon angioplasty preceded by ultrasound is or is not any better for heart attack patients than is
• 请教一下大家， 这边but 后面为什么要加 that? that 在这边怎么理解呢？非常感谢！
• OA 是 C
  

summer19890825

同问。。。

summer.ayan

'that' 是跟最前的 'Researchers agrees THAT' 相平行