Just contradict them the entire time. 'X thing is bad because Y reason' "No it's not" 'Yes it is' "No it's not" Continue this until your class is dismissed.

At least you got someone to help

At least you have nice opponents and it's hopefully a way for you to meet new people.

Somehow tie in a point that highlights the help that your group gave you in preparation for the debate.

They're doing that because if you get destroyed in three straight debates, you are crowned the winner. That's how it works in America. USA! USA! USA!

Nice competition tho!

Bring it up with your teacher, and of the teacher doesn't do anything about it go to the head of their department or the student counselor. If they don't do anything, go to the principal/dean/headmaster. Prepare an excellent speech to give to them about the immorality of forcing someone to stay in a group that is refusing to contribute to a project that effects the grades of everyone in the group. If your teacher or school is worth even a grain of salt, they should reassign you to another team.

This is exactly why I hate group projects.

It is a hoax. it's bullshit made up by the government to scare you into following their guidelines. It's also a way to tax businesses. why do you think they have all left this country? It's EPA,taxes,fees, Read up on it. Don't Buy into the bullshit.

Just make sure that when you die they're the ones who place you into the grave so they can let you down one last time.