GMAT 考满分题库

OG16 - 语法SC - 67
Some anthropologists believe that the genetic homogeneity evident in the world's people is the result of a "population bottleneck" -at some time in the past our ancestors suffered an event, greatly reducing their numbers and thus our genetic variation.
  • A at some time in the past our ancestors suffered an event, greatly reducing their numbers 分析该选项
  • Bthat at some time in the past our ancestors suffered an event that greatly reduced their numbers 分析该选项
  • Cthat some time in the past our ancestors suffered an event so that their numbers were greatly reduced, 分析该选项
  • D some time in the past our ancestors suffered an event from which their numbers were greatly reduced 分析该选项
  • Esome time in the past, that our ancestors suffered an event so as to reduce their numbers greatly, 分析该选项
显示答案
正确答案: B

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