文档介绍：46. 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
考察not only...but..的平行
not only were ...but they 不平行
Not only were...but creating不平行
Not only to do...but to do平行,正确
Not only to do...but doing不平行
Not only able to...but they were..不平行
47. Until Berta and Ernst Scharrer established the concept of neurosecretion in 1928, scientists believed that either cells secreted hormones, which made them endocrine cells and thus part of the endocrine system, or conducted electrical impulses, in which case they were nerve cells and thus part of the nervous system.
(A) either cells secreted hormones, which made them
(B) either cells secreted hormones, making them
(C) either cells secreted hormones and were
(D) cells either secreted hormones, in which case they were
(E) cells either secreted hormones, which m