Question Detail We have been working off and on for several days to complete this project. constantlyon and off regularlyon or offno error Answer: Option B Similar Questions : 1. Neetu friends are waiting for her since morning. have been waitingwere waitingwaitNo correction Answer: Option A 2. Hardly does the sun rise when the stars disappeared. have the sun rosehad the sun risendid the sun rosethe sun roseNo correction required Answer: Option BExplanation:(Asked in BSRB Exam, Patna) 3. While walking across the river a car knocked him down. he was knocked down by a cara car knocked himhe was by a car knockedNo improvement Answer: Option A 4. She sat the entrance examination last year. sat insat atsat forNo correction Answer: Option C 5. What happens to all those travellers was not known? What happened to allWhat is happens to allWhat happened allNo correction Answer: Option A Read more from - Sentence Correction