[单项选择]下列哪一项为亚急性细菌性心内膜炎的特点( )。 A. 心室扩张,室壁变薄,可见纤维化癜痕及附壁血栓,常合并各种类型的心律失常 B. 视网膜见卵圆形出血斑块伴中心呈白色 C. 不均等的心室间隙肥厚 D. 心室腔变小,心肌活检见心肌细胞畸形肥大排列紊乱 E. 常有发热和与发热程度不平行的心动过速及各种心律失常
第14题: [单项选择]If there were no hungry problem, the people of the world ______ a much happier time in their daily life. A. Should have B. will have C. must have D. have 参考答案:A 答案解析:[解析] 由从句可知这句话是虚拟语气,表示对现在情况的虚拟,动词形式为:从句:动词的过去式(be的过去式一般用were),主句:would/should/could/might+动词原形。