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Select from the given options the one that includes a usage error. If all of the options are correct, select "no mistakes."
The correct answer features inconsistent pronoun usage. Since the sentence first uses the pronoun "one," the sentence must remain consistent in its usage of that pronoun. It is incorrect to follow "one" (when used as a pronoun) with "you." The correct version of the sentence reads, "It is very important to look both ways when one crosses the street because one never knows when a car might come." This question interrogates the principle of consistent pronoun usage. None of the other options included any grammatical errors.
Compare your answer with the correct one above