Question

By the time Bella arrived at the meeting, the speakers __________________ already presented their plans for company improvements.

Answer 1

Had.

Step-by-step explanation:

• The given sentence is an example of the past perfect tense.
• The past perfect is generally used at the time when two events happened in the past, with one past action occurred even before the other.
• To construct any sentence of the past perfect tense, one is required to use "had" with the past participle of a verb.