By the autumn, I _ for 45 years!
Correct answer: A. Shall have been teaching
- A. Shall have been teaching
- B. Have teaching
- C. Teaching
- D. Teach
Explanation
The sentence is future perfect continuous which shows action started in the past and will continue up to a future time. For future perfect continuous, the structure is: Subject + shall/will + have been + verb-ing.
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