Hi Freinds,
I am having difficulty with this problem. Need help.
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
OA after some discussions.
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Nitrogen and diamond
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Dean Jones
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Ozlemg
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A clear C
"Not only but also" usage is parallel. On the other hand, D, the second best, repeats "able to" that creats redundancy!
(C) were able not only to transform the gas into a solid but to create
"Not only but also" usage is parallel. On the other hand, D, the second best, repeats "able to" that creats redundancy!
(C) were able not only to transform the gas into a solid but to create
The more you suffer before the test, the less you will do so in the test! 
