通过下列问题请说明for和to的用法区别

题目

通过下列问题请说明for和to的用法区别
您好,ammesty听说您英语棒极了,我马上就要考试了,
请问for和to怎么区别?这些题为什么有一些选for的选项,有一些选to的?
下列哪个选项是对的（原句跟A选项相同,但是不一定是对的）
Q1.Scientists claim that the discovery of the first authenticated mammal bones in amber could provide important clues in the determination of how and when the islands of the West Indies were colonized by mammals.
A.x05in the determination of how and when the islands of the West Indies were colonized by mammals
B.x05to determine how mammals colonized the islands of the West Indies and when they did
C.x05for determining how and when mammals colonized the islands of the West Indies
Answer:C
17.GWD-26-Q17
Responding to the public’s fascination with-and sometimes undue alarm over-possible threats from asteroids,astronomers have developed a scale to rate how likely a particular asteroid or comet will be to collide with Earth.
A.astronomers have developed a scale to rate how likely a particular asteroid or comet will be to
B.astr

答案