Flight EP 476 to Yerevan has been __ cancel canceled canceling

## Step 1
The sentence is in passive voice, which means the action is done by someone or something else. In this case, the action is the cancellation of the flight.
## Step 2
In English grammar, the past participle form of the verb is used in passive voice. The past participle of the verb 'cancel' is 'canceled'.
## Step 3
Therefore, the correct form of the verb to use in this sentence is 'canceled'.