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Agriculture is the countrys chief source of wealth, wheat _____ by far the biggest cereal crop. A. is B. been C. be D. being Key: D 本题考的是独立主格结构。 我们要来复习的就是独立主格结构. 1)名词/代词+分词 The foreign travelers had many talks with the natives, the guide acting as an interpreter . He being absent, nothing could be done. The floor being wet and slippery , we stay outside. All things considered, I think I ought to award the job to Mrs. Smith. 1. 独立主格结构的语法形式是：主语+非谓语动词。 2. 非谓语动词有三种：(1)to+v. (2)v. ing (3)v. ed 3. 非谓语动词的特点： 1) 时间关系： (1) 不定式具有后时性 (2) ing 分词具有同时性 (3) ed 分词具有先时性 e.g. Here are the first two volumes, the third one to come out next month. They visited Danxia Mountain yesterday, Miss Lee acting as the tourist guide. His work done, he went home. | 
