题目

呼吸系统吸进的氧气进入人体后，最终要送达 （） A . 心脏 B . 肺 C . 血液 D . 细胞 答案：D(2009福州市高中毕业班第一次单科质量检查) Why didn’t you tell me there was no class today? You _____ me about it earlier. A. ought to have told                         B. should tell C. should have been told                D. ought to be told