Select the most appropriate option to fill in blank no. 3.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. had proved.
- We use past perfect tense to talk about something that happened before another action in the past.
- The former action is usually expressed in the simple past tense.
- The passage is in past and the sentence refers to some events of further past.
- Hence, the blank must be filled in with "had proved".