※ 引述《yenway928609 (加油)》之铭言：
: Scientists claim that the discovery of the first authenticated mammal bones
: in amber could provide important clues [of determining, in addition to how,
: when mammals colonized the islands of the West Indies].
: A of determining, in addition to how, when mammals colonized the islands of
: the West Indies
: B in the determination of how and when the islands of the West Indies were
: colonized by mammals
: C to determine how mammals colonized the islands of the West Indies and when
: they did
: D for determining when the islands of the West Indies were colonized by
: mammals and how they were
: E for determining how and when mammals colonized the islands of the West Indies
: 我选的是C，答案为E，可是表示一个动作to + do 不是比for + ving 好吗
限定的不定词修饰语, 表目的时动作逻辑主语为前面的action,
不表目的时逻辑主语为接近的名词, 在C为clues,
但是若clues无法做determine这个动作时, 用for determing
表达for people to determine的概念.