Idiom Meaning - Reinventing the Wheel

CMAT 2019 · LC · Easy · Vocabulary

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In the following sentence, what does the underlined phrase mean?

A good teacher is one who sees to it that a student does not waste time in reinventing the wheel?

  1. A.

    waste time on unnecessary details

  2. B.

    repeating oneself

  3. C.

    waste time in imaginary things

  4. D.

    doing something that has already been done

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