关于than后的IS位置的疑问

krusher

Researchers agreed that the study of new treatments for heart attack patients was
extremely important butmore research was needed to determine that balloon angioplasty
preceded with ultrasound was or was not any better for heart attack patients thanthe
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
这道题答案是C 但是我的疑问是 than后到底用不用加is 若然，is位置在何处
亦即
X is any better than Y

or

X is any better than is Y

or

X is any better than Y is

Jeffrey-N

无所谓。。。。亲。。。。

krusher

以上三句话意思一样，都是主语比较，当前半句没有宾语时，后半句不必要补出助动词（但不出来不算错，只是pr ...
ximenheng 发表于 2013-2-3 07:16

但是这个不用考虑than后部分顺序要与前面的一致么、、、

ximenheng

以上三句话意思一样，都是主语比较，当前半句没有宾语时，后半句不必要补出助动词（但不出来不算错，只是prefer的层面选择）

至于后半句补出的helping verbs放在那里？——都一样。。。。。。