※ 引述《yenway928609 (加油)》之銘言：
: 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
: 我選的是C，答案為E，可是表示一個動作to + do 不是比for + ving 好嗎
限定的不定詞修飾語, 表目的時動作邏輯主語為前面的action,
不表目的時邏輯主語為接近的名詞, 在C為clues,
但是若clues無法做determine這個動作時, 用for determing
表達for people to determine的概念.