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In the following questions, a sentence has been divided into four parts and marked a, b, c and d. One of these parts contains a mistake in grammar Idiom or syntax. Identify that part and mark it as the answer.

A. If one reads the newspaper regularly

B. you will be surprised at the improvement

C. in your overall reading skills

D. day by day

Please do not use chat terms. Example: avoid using "grt" instead of "great".