一个近来常考到的独立主格问题

With
surface temperatures estimated at minus 230 degrees Fahrenheit, Jupiter's moon Europa
has long been considered far too cold to support life, and with 60 square
miles of water thought to be frozen from top to bottom.

A.
Europa has long been considered far too cold to support life, and with

B.
Europa has long been considered far too cold to support life, its

C. Europa has long been
considered as far too cold to support life and has

D.
Europa, long considered as far too cold to support life, and its

E.
Europa, long considered to be far too cold to support life, and to have

这题的答案是B，而我误选的是C，当时的感觉，its。。。是逗号连接两个独立句子，所以。。。

回头看看，现在觉得B中的its。。。是独立主格起状语作用，但希望和大家讨论的是，

怎么区分到底是，＋独立主格，还是，＋独立句子呢？ 希望了解的朋友不吝赐教，先给您作揖了。

1.没有with/without是可以的。

2.我觉得独立主格是修饰整个主语的~不过可能不对啊，我的感觉而已。

对于lz提出的题，因为我一般来说是根据整个句子的逻辑关系来看题。从这个角度来看，只有B说的通。

这个是不对的，这是两个句子。独立主格部分应该不是完整的句子，如lz列的那道题：the water thought.....,这是一个不完整的结构，完整应该是the water is thought....

判断是独立主格还是分句其实没有那么难，只要看后面是不是一个完整地句子，是的话就是两个分句，是不可以仅有逗号就连接的，若不是就是独立主格。我想后来举得这个例子应该可以改成这个样子，My boyfriend leaving me, my sisiter cried.  我的感觉是独立主格多表示一种伴随的状态，有一个例子是老师讲课时举的：the little was crying, her hands covering her face.