It's a one-party state with all candidates chosen by the party.

It may wear the skin of a democracy, but it is not a democracy.

This is the vaguest description ever and it's not even correct with the vague points. There are multiple parties, and given that there are multiple parties the candidates certainly aren't chosen by one party.

How are candidates chosen? Who elects them? When are elections held? What is the structure of the elections?

Do you know any of these things? Serious question. Have you ever investigated and learned this topic thoroughly? You know how the US system works I assume, I bet you vaguely understand some other systems too, like parliamentary ones such as the UK (or not, could be wrong). Have you ever actually investigated the topic or have you just passively repeated vague statements made by other people who are also passively repeating vague statements about it?

If you want me to I can in fact give you a fairly good summary of how the Chinese system actually works. But do you even want to know? Are you actually open to learning?