— Sally got a high position in our company.  

— Really? _____ made her stand out from so many people?[ ]

A. What it was that

B. That was it what

C. What was it that

D. That it was what

学习支持服务在开放教育学习中具有重要作用，这是开放教育不同于普通高等教育的鲜明特色之一。