By pressing a tiny amount of nitrogen between two diamonds to a pressure of 25 million pounds per square inch, scientists not only were able to transform the gas into a solid, but they also created a semiconductor similar to silicon.
可以省略 By pressing a tiny amount of nitrogen between two diamonds to a pressure of 25 million pounds per square inch, scientists not only were able to transform the gas into a solid, but they also created a semiconductor similar to silicon. (A) not only were able to transform the gas into a solid, but they also created (B) not only were able to transform the gas into a solid but also creating (C) were able not only to transform the gas into a solid but to create (D) were able not only to transform the gas into a solid but also creating (E) were not only able to transform the gas into a solid, but they were also able to create 这题选C 省略了also