长难句--求高手划分句子结构!截选gmat OG阅读

题目

长难句--求高手划分句子结构!截选gmat OG阅读
However,none of these high- technology methods are of any value if the sites to which they are applied have never mineralized,and to maximize the chances of discovery the explorer must therefore pay particular attention to selecting the ground formations most likely to be mineralized

答案

整个句子是一个由and连接的表示并列关系的复合句. 逗号前面是一个句子,逗号后面是一个句子,这两个是并列关系. 先说逗号前面的句子,这是一个主系表结构,同时内含一个if引导的条件状语从句,而这个条件状语从句中又内含...