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Writing > Improving Sentences

Part of the following sentence is underlined; beneath the sentence are five ways of phrasing the underlined material. Select the option that produces the best sentence. If you think the original phrasing produces a better sentence than any of the alternatives, select choice A.

Johannes Gutenberg is generally credited to bring together the two main concepts of modern printing: movable pieces of metal type that could be reused, and a printing press for producing sharp impressions on paper over and over.