P177 48. The product was so secretly researched and tested in corporate headquarters that consumers were unaware of its existence until it reached the stores and created a flurry of interest.
A The product was so secretly researched and tested in corporate headquarters that
B So secretly was the product researched and tested in corporate headquarters that
C Researched and tested in corporate headquarters so secretly that
D The research and testing of the product in corporate headquarters has been so secretly that
E A product was so secretly researched and tested in corporate headquarters sa to make