Select the most appropriate option to fill in blank no. 4.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. have been.
The present perfect tense ("have been") is used to describe actions or states that started in the past and continue to the present, or have relevance now.
In this case, digital networks started playing a crucial role in movements like MeToo and Black Lives Matter in the past, and they are still significant today.