In the following sentence, one part is highlighted as grammatically correct. Identify the part among the other four that contains a grammatical error,...
Question
In the following sentence, one part is highlighted as grammatically correct. Identify the part among the other four that contains a grammatical error, or select "No error" if the sentence is correct as a whole.
If an invention claimed in (A) / a patent can be (B) / shown to exist or (C) / been described previously, it / invalidates the patent. (D) / No error (E)