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Q: Fill in the blank with the Past Perfect Continuous Tense The doctor was very tired as he ......... alone.
  • A. has worked
  • B. had worked
  • C. has been working
  • D. had been working
Correct Answer: Option D - The doctor was very tired as he had been working alone.
D. The doctor was very tired as he had been working alone.

Explanations:

The doctor was very tired as he had been working alone.