请教新prep1-250

emilyliyuzhi · 发表于 2009-11-1 14:48:46

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
答案C 选项不理解，为什么后半句中是is？

Raymond_GMAT · 发表于 2009-11-1 17:25:55

is的主语是whether引导的从句，所以用单数

milichen · 发表于 2010-1-20 21:07:46

主语是balloon angioplasty, 单数；描述客观事实，is.

本贴相关题目 GMATPrep-2008E1-SC-250 | TN-20-SC-29 (ZBZE)

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