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].

Until the last twenty eight years, he has been working in various units of this plant.

A) For                               

B) Since

C) During              

D) No improvement