Question

I ...(wait)here for hour last Monday before the bus came
.have been waiting
.was waiting
.has been waiting
.had waited​

Answer 1

I have been waiting for hour last Monday before the bus came.

Answer 2

Answer:

had waited

Explanation:

HAD, have and has is used when there are two actions used in the sentence and they are used in the earlier action. This was in the past tense so I used had