04-11 语法一道

以下是引用wl_xiao在2006-8-14 15:24:00的发言：
Archaeological explorations and excavations indicate_____ in Nebraska as early as 9000 BC.
A) prehistoric humans whose presence
B) that prehistoric humans present
C)the presence of prehistoric humans
D) when prehistoric humans who were present

选C，但我觉得用C， As early as  9000 BC 在这句中是修饰Indicate。总感觉C有问题。
感觉应该将B改为，Presented更对。