标题: 求教GWD30-Q29 [打印本页] 作者: Miamiami 时间: 2010-5-17 18:18 标题: 求教GWD30-Q29 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 with ultrasound was or was not any better for heart attack patients that the balloon procedure by itself.
答案 C that more research was needed to determine whether balloon angioplasty preceded by ultrasound is any better for heart attack patients than
这里的is 怎么理解呢？？整个语境是过去时啊？前面那个并列的分句也是过去时啊？？作者: maratderk 时间: 2011-5-9 14:00
顶这个问题啊作者: skyemotion 时间: 2011-5-9 14:13
is是这个从句的谓语 whether balloon angioplasty preceded by ultrasound is any better for heart attack patients than