question_answer

Direction: In the following questions, a part of the sentence is underlined. Below are given alternatives to the underlined part at [a], [b] and [c] which may improve the sentence. Choose the correct alternative. In case 'No improvement' is needed, your answer is [d].

He has been working off and on for several years to compile a dictionary.

A)  on or off                      

B) on and off

C) regularly           

D) No improvement