In each question in the following, four alternative sentences are given. ChooseCORRECT one and fill in the circle corresponding to that letter in the answer sheet.
Correct answer: A. I'm a policeman and I usually have to work at Christmas.
- A. I'm a policeman and I usually have to work at Christmas.
- B. I'm a policeman and I usually have to work by Christmas.
- C. I'm a policeman and I usually have to work through Christmas.
- D. I'm a policeman and I usually have to work on Christmas,
Explanation
I'm a policeman and I usually have to work at Christmas."Reason: This option indicates that the policeman typically has duty on Christmas Day itself. "At Christmas" suggests working during the period of Christmas, which encompasses the day itself.
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