请教og11-37，这个句子的结构？

four times as many Americans were killed as would 。。。这个句子，是不是有倒装？

as many as的比较对象是什么？虽然语感上来说，A肯定是最好的，但我找不到合适的主谓宾，还有合适的比较对象。。。

请帮忙分析一下，谢谢。

37.    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.

Americans were killed than

Americans were killed than those who more

Americans were killed as there more

Americans were killed as those who

两个时间地点死的美国人数做比较，

Americans who were killed in one of the bloodiest battles of the Civil War, fought at Sharpsburg, Maryland, on September 17, 1862 are four times as many as those  were killed on the beaches of Normandy during D-Day.

同问！

这题的主语是不是 four times as many Americans ， 谓语是were killed， 然后后面的是固定搭配的补充说明？

应该是省略了主语吧。

four times as many Americans were killed as (Americans) would later be killed on...

four times as many Americans were killed as (Americans) would later be killed on...