the cause of the oil leaks, the specialists can not draw a conclusion before pleting a thorough and detailed investigation.
A. With regard to
B. Regardless of
C. In response to
D. In spite of
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(答案→)A. With regard to
B. Regardless of
C. In response to
D. In spite of
解析：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。