_____the cause of the oil leaks, the specialists can not draw a conclusion before pleting a thorough and detailed investigation.A.With regard toB.Regardless ofC.In response toD.In spite of
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A解析试题分析：考查介词短语：A. With regard to关于B. Regardless of不管C. In response to 做为回应，D. In spite of虽然，句意：--关于石油泄漏的原因，专家在充分详细的调查前不能做出结论。选A。考点：考查短语辨析
点评：本题考查了介词短语，在平时要加强识记和记忆。做题时要结合上下文判断。这几个介词短语高考都是经常出现的。