Which of the phrases given should replace the phrase in bold... — Communication Ability 2018

Question 283 Communication Ability 2018 Medium MCQ +1.00 marks

Which of the phrases given should replace the phrase in bold to make the sentence grammatically correct? He has been working off and on for several years to compile a dictionary. (Phrase in bold: off and on)

A. regularly B. on and off C. on or off D. on and of

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