Question

there were a lot of people in the park because ................( was) a very sunny day.
past perfect tens ​

Answer 1

It had been.

The past perfect tense of was is "had been" .

So, the sentence is :

There were a lot of people in the park because it had been a very sunny day.

Answer 2

There were a lot of people in the park because it had been a very sunny day
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