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Read each sentence to find out whether there is any grammatical mistake error in it. The error if any, will be any part of the sentence. Make the number of that part with error as your answer. If there is 'd) No error', mark.

A. When the boy committed a mistake,

B. the teacher made him to do

C. the sum again

D. No error

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