Main point常用的错误选项是 1)restating a premise(要记住,premise永远对) 2)listing an intermediate conclusion 3)giving you sth you could infer or conclude from the passage
分辨的基准是,这种premise通常在conclusion句中以插入语方式(而且多半被because 或given that等引导)出现,插入语则并非conclusion的一部分。 如 Therefore, because premise X, conclusion Y. So, due to X, conclusion Y.