句号要点圆,逗号要出撇。
(2)Although simple versions of miniature devices have had an impact, advanced versions are still several years away. (选自2011年12月六级听力) 【真题解析】本句考查although引导的让步状语从句。句子前半句为否定句,后半句为肯定句,是典型的转折关系。 【参...