What has just happened?
What has been just happened?
The first one is right, but my friend told me that we can't use “has been [...] happened” because it has two past participles, which is ungrammatical.
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What has been just happened?
The first one is right, but my friend told me that we can't use “has been [...] happened” because it has two past participles, which is ungrammatical.
As Andrew has said, it is perfectly possible to have two past participles in a passive clause. What is not possible is to make a passive clause with an intransitive verb such as happen. That is why ‘What has been just happened?’ is ungrammatical.