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1. Choose the correct form---

  • A. He fell down while he was walking
  • B. He fell down while he was walking
  • C. He fell down while he was walking
  • D. He fell down while he was walking

Answer: Option A

Explanation:

the correct form - - - He fell down while he was walking.

Structure: while + sub + auxi. verb + মূল verb + ing.

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