gwd中间还是有道题不十分确定，尽请各位高手指点

evanxie9669

The health benefits of tea have been the subject of much research; in addition to its possibilities for preventing and inhibiting some forms of cancer, the brewed leaves of Camellia sinensis may also play a role in reducing the risk of heart disease and stroke.

?in addition to its possibilities for preventing and inhibiting

?in addition to its possibilities to prevent or inhibit

?besides the possibility that it prevents and inhibits

?besides the possible preventing and inhibiting of

?besides possibly preventing or inhibiting

正确选项是E，可是我的疑问是
1、besides是介词和副词两种词性，副词应该单用，此处作介词，那么这的besides一般搭配名词。好了，若果是“besides preventing or inhibiting，……”，那么这两现在分词可以理解为名词，但多了一个possibly ，明显使这两个ing变成动词形式，变成了修饰主句的状语，和besides也不能搭配。
2、就算问题1可以忽略，那么besides这个clause之后的句子应该包含并列成分，但之后的主句看不见任何并列成分。

求解！！万分感谢！！

myancamel

朗文的例句：
besides doing sth
besides being heartbroken, she felt foolish

按照这样理解
besides应该是副词

血翼蝙蝠拉么

besides在这儿应该是副词，完全可以把它盖住不看，剩下的逗号前就是分词作伴随状语，逻辑主语是leaves。我的问题是其他几个选项错在哪了。