[求助]大全652，比较什么？

1.        Since the movie was released seventeen UFOs have been sighted in the state, which is more than had been sighted in the past ten years together.

(A) which is more than had been sighted

(B) more than had been sighted

(C) more than they had sighted

(D) more than had reported sightings（B）

(E) which is more than had reported sightings

这题能选对，但不明白结构，比较什么？more than后面省略了什么吗？怎么看了觉得奇怪。

我感觉：原句有点儿问题。

Since the movie was released, seventeen UFOs have been sighted in the state, which is more than had been sighted in the past ten years together.

在released后面是不是掉了一个逗号？

(B) more than had been sighted是逗号后的内容，作为伴随，that 必须因此而省略。类似的还有：“，four times as many as are killed ..." 这个例子偶暂时找不到了；以后遇到了再加。

是不是这个：

1.        In one of the bloodiest battles of the Civil War, fought at Sharpsburg, Maryland, on September 17, 1862, four times as many Americans were killed as would later be killed on the beaches of Normandy during D-Day.

(A) Americans were killed as

(B) Americans were killed than

(C) Americans were killed than those who

(D) more Americans were killed as there（A）

(E) more Americans were killed as those who

但这里were killed前面有Americans呀。

还有，你说前面是省略了that吗？应该是those吧？

以下是引用JerryGuan在2004-4-26 0:30:00的发言：

我感觉：原句有点儿问题。

Since the movie was released, seventeen UFOs have been sighted in the state, which is more than had been sighted in the past ten years together.

在released后面是不是掉了一个逗号？

(B) more than had been sighted是逗号后的内容，作为伴随，that 必须因此而省略。类似的还有：“，four times as many as are killed ..." 这个例子偶暂时找不到了；以后遇到了再加。

这个划绿线的部分，哪位牛牛能再解释的详细一点？不是很明白的说。拜谢！

不同意more than had been sighted表伴随，个人认为是主句比较的一部分：比的是谓语，同大全236题：

236. Degler does more than merely summarizing existing research; he constructs a coherent picture of two centuries of studies dealing with the changing roles of women.

(A) Degler does more than merely summarizing

(B) Degler’s study is more than a mere summarizing of

(C) Degler has done more than a mere summarizing of

(D) Degler’s study has done more than summarize merely (E)（E）

(E) Degler does more than merely summarize

这样的省略在og中也有的，是在一道题目的未划线部分，可惜我现在找不到了

请问比较中的主语省略有没有什么原则

谢谢