Select the most appropriate option to substitute the underlined segment in the given sentence. If there is no need to substitute it, select ‘No substitution required’.
Since 10 o’clock in the morning he worked on this design.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. he has been working.
- The original sentence uses "worked," which is a past simple tense. However, since the action began in the past and is still ongoing, the present perfect continuous tense is more appropriate.
- "Has been working" correctly indicates that the action started in the past and continues up to the present moment.