Select the most appropriate option to fill in blank 3.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. fighting.
Why "fighting" fits:
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The sentence talks about two friends who joined the army. Then war began (war broke out).
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So, “fighting in the same unit” means they were serving and battling together in the same group.
Grammar and context:
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The word “fighting” is a present participle (verb+ing) used to describe what they were doing during the war.
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It fits both logically and grammatically with “were”.
Hence, the chosen option will be correct.