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问题: for that的用法

An investigation was made into the accident, ________ fifty people were killed.
  A) for that
  B) where
  C) when
  D) in which

如何作答?thank you!

解答:

答案应该选D。
这是介词加关系代词引导的一个非限制性定语从句。in which等于in the accident。