In these questions, a part of the sentence is bold which may need improvement. Alternatives are given at (a), (b) and (c) below, one of which may be a better option. In case of no improvement is needed, your answer is (d).Question:As soon as she noticed the workmen, she asked them (What they have been doing).

• A. have done
• B. had been
• C. are doing
• D. No improvement