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What is the grammatical function of the word “suddenly”:

Read the text to answer questions 20, 21 and 22.


We were on a flight to Tokyo, and we’d been flying for about five hours. I was reading a book, and my wife was watching a film when suddenly we heard a very loud noise. It sounded as if an engine had exploded. The pilot didn’t tell us what had happened until half an hour later.


Source: OXENDEN, C.; LATHAM-KOENIG, C. English File Upper-Intermediate - Student's Book - Third Edition. Oxford: Oxford University Press, 2019.

What is the grammatical function of the word “suddenly”:


A

Adverb of time.


B

Adverb of manner.


C

Adverb of frequency.


D

Adverb of degree.