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