2015-2016学年 译林版 必修三 unit 3 Back to the past grammar课件 (5)
2015-2016学年 译林版 必修三 unit 3 Back to the past  grammar课件 (5)第3页

在英语句子里,谓语受主语支配,谓语动词必须和主语在人称和数量上保持一致,这就叫主谓一致

主谓一致的定义

5. Every means ______ tried but without much result. A. has been B. have been C. are D. is