Question

while I_(read) a book, he shouted at me(use suitable tense)​

Answer 1

Was Reading

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Answer 2

While I was reading a book, he shouted at me.

Explanation:

In the sentence, 'shouted' indicates that the tense of the sentence is past tense. Also, 'while' indicates that the action of the subject is ongoing. Thus, it must be a verb in past continuous tense. And hence, the answer is "was reading".