TTGWD28难道又是我错了??

jessiebetty

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.

 

1. of determining, in addition to how, when mammals colonized the islands of the West Indies
2. in the determination of how and when the islands of the West Indies were colonized by mammals
3. to determine how mammals colonized the islands of the West Indies and when they did
4. for determining when the islands of the West Indies were colonized by mammals and how they were
5. for determining how and when mammals colonized the islands of the West Indies

请问为什么不是C是E??

能否顺便告知下28套的1.12.24.30的正确答案,感觉他的不对