关于prep笔记1-110的疑问，请各位帮忙，不胜感激！

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Prep1-110.(30399-!-item-!-188;#058&004205)

The federal immigration station on Ellis Island, which was first opened in 1892, then rebuilt in 1900, processing nearly three quarters of all immigrants entering the United States in the first quarter of the twentieth century.

(A) The federal immigration station on Ellis Island, which was first opened in 1892, then rebuilt in 1900, processing nearly three quarters of all immigrants entering the United States

in the first quarter of the twentieth century.

(B) Having processed nearly three quarters of all immigrants who enter the United States in the first quarter of the twentieth century, the federal immigration station on Ellis Island

first opened in 1892 and then was rebuilt in 1900.

(C) Processing nearly three quarters of all immigrants to enter the United States in the first quarter of the twentieth century, the federal immigration station on Ellis Island

first opened in 1892, being rebuilt in 1900.

(D) First opened in 1892, then rebuilt in 1900, the federal immigration station on Ellis Island processed nearly three quarters of all immigrants entering the United States

in the first quarter of the twentieth century.

(E) Of all immigrants to enter the United States in the first quarter of the twentieth century, the federal immigration station on Ellis Island

processed nearly three quarters of them, having first opened in 1892 and rebuilt in 1900.
疑问：由此题想请教一下对于动词的形式，如何区分一个动词是过去分词做得修饰语还是过去式做得谓语??（因为好多动词的过去式和过去分词形式一致）是从意思上判断还是从动词的发起者上判断？

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从及物和不及物上判断
动词的过去分词做修饰成分，这个动词一定是及物动词，只有及物动词才有过去分词形式作修饰成分
动词的过去式做谓语，如果看上去形式跟过去分词容易混淆，那一定是不及物动词，因为如果是及物动词，后面跟宾语，就不会混淆了。

当然，有时候一些动词既可以及物又可以不及物，那就看句子结构了。这里的opened和rebuilt应该是过去分词而不是过去式，如果作为过去式出现在句首，前面的主语是不能省略的。

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这么说就得明确什么是及物动词什么是不及物动词？有什么好办法区分这个么？谢谢您的回复！