如何判断独立主格结构与其他的区别？

空格空格

[size=14.399999618530273px]Most states impose limitations on the authority of the legislature to borrow money, with their objectives being to protect taxpayers and the credit of the state government.

• Ato borrow money, with their objectives being to protect
• Bto borrow money, the objectives of which are the protecting of
• Cto borrow money, limitations intended to protect
• Dfor borrowing money, of which the objective is protecting
• Efor borrowing money, limitations with the intent of protecting
  

比如这一题，答案是C 但是我在做题的时候判断c是属于逗号连接两个完整的句子

但是解释说的c是独立主格结构
遇到这种情况应该如何判断呢？

兰心寒

这个是要看意思的。
原句中，Most states impose limitations on the authority ... to borrow money, limitations intended to protect taxpayers and the credit of the state government.
楼主再想想，这个intended是动词过去式还是过去分词呢？即，是limitations想/intend去保护谁谁谁，还是state？
判断独立主格的情况，需要分辨出分句其实是省略be了的。