关于than后的IS位置的疑问

九尾

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

sisichen666

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。。。。。。

九尾

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。。。。。。

-- by 会员 sisichen666 (2012/12/5 22:00:42)

但是这个不用考虑than后部分顺序要与前面的一致么、、、

sisichen666

无所谓。。。。亲。。。。

九尾

无所谓。。。。亲。。。。

-- by 会员 sisichen666 (2012/12/6 7:52:10)

亲 谢谢啦 帮我好多次啦

udsifhi

楼主说的这个题，主语比较，than后面不补出is为什么不会造成比较对象歧义？

乃们还记得这道题吗
Innits of the Bering Sea were in isolation from contact with Europeans longer than Aleuts or Inuits of the North Pacific and northern Alaska.
（A） in isolation from contact with Eurpoeans longer than
（B） isolated from contact with Eurpoeans longer than
（C）in isolation from contact with Eurpoeans longer than were
（D） isolated from contact with Eurpoeans longer than were
（E） in isolation and without contact with Eurpoeans longer than
选D，不选B，就是为了消除歧义！

我好晕啊啊啊求指点！